Abstract: Described are embodiments of apparatuses and systems including a hybrid laser including anti-resonant waveguides, and methods for making such apparatuses and systems. A hybrid laser apparatus may include a first semiconductor region including an active region of one or more layers of semiconductor materials from group III, group IV, or group V semiconductor, and a second semiconductor region coupled with the first semiconductor region and having an optical waveguide, a first trench disposed on a first side of the optical waveguide, and a second trench disposed on a second side, opposite the first side, of the optical waveguide. Other embodiments may be described and/or claimed.

Abstract: An optical transmission circuit device generates first and second optical signals from differential set and reset signals each time digital electric input signals of N bits are received. The differential set signal indicates an increase in signal strength relative to immediately preceding N bits of the digital electric input signals and the differential reset signal indicates a decrease in signal strength relative to the immediately preceding N bits. An optical reception circuit device generates first and second digital signals from the first and second optical signals and a third digital signal from the first and second digital signals, a magnitude of the third digital signal being increased by the first digital signal and decreased by the second digital signal. The optical reception circuit further generates a digital output signal of N bits from the third digital signal and an immediately preceding N bits of the digital output signal.

Abstract: An optical communications card is provided that has multiple parallel optical communications modules mounted on one or both sides of the card. A plurality of the optical communications cards can be edge-mounted and/or mid-plane mounted in an optical communications system such that the cards are electrically connected to a motherboard PCB. Because the spacing, or pitch, between the edge-mounted or mid-plane mounted cards can be very small, the cards can be mounted with very high density to provide the optical communications system with very high bandwidth.

Abstract: The invention relates to a rotary transmission device for machine tools, comprising a stator part that is rigidly attached to the machine, a rotor part that is rigidly attached to the tool and can be rotated about a rotational axis, and stator-side and rotor-side transmitting and receiving elements for bidirectionally transferring data without contact. According to the invention, in order to guarantee trouble-free data transfer even for inductive energy transmission at high power, the transmitting and receiving elements are designed as optoelectronic components, which are combined on the stator part and the rotor part to form stator-side and rotor-side transmitter groups and receiver groups each having associated transmitting and receiving electronics.

Abstract: A time-interleaved A/D converter apparatus has a primary signal A/D converter circuit group that is time-interleaved with a combination of N A/D converter circuits, a correction signal generation part operable to receive the input analog signal and a 1/m-sampling signal having a speed that is 1/m of a rate of the sampling signal inputted to the primary signal A/D converter circuit group, to extract a dispersion of a transmission line that is immanent in the input analog signal, and to output the dispersion as a dispersion compensation control signal used for digital signal compensation, and a signal processing part operable to convert the N digital signals into one digital signal based upon the dispersion compensation control signal and to compensate a dispersion included in the converted digital signal.

Abstract: An optical transmission system includes an optical emitting device and a plurality of optical receiving devices. The optical receiving devices are optically connected in series and one of the optical receiving devices is optically connected to the optical emitting device. Each of the optical receiving devices includes a control module, an optical receiving terminal, and an optical fiber amplifier. The optical emitting device emits out first optical signals or second optical signals. The control module transmits the first optical signals to the optical receiving terminal or transmits the second optical signals to the optical fiber amplifier. The optical fiber amplifier amplifies the second optical signals and sends the amplified second optical signals to the next optical receiving device.

Abstract: The present disclosure discloses a method and a communication system for time synchronization. The system includes at least one base station, an optical line terminal OLT, and a fiber for transmitting information between the base station and the OLT. The system further includes a clock synchronization server, configured to transmit synchronization data between the clock synchronization server and the at least one base station, so that time synchronization is implemented between the at least one base station and the clock synchronization server. According to the solutions provided by the present disclosure, the system apparatus is simple, and the cost low.

Abstract: An apparatus for providing communications between a first device disposed at a tubular and a second device, the tubular having tubular sections and being configured to be disposed in a borehole penetrating the earth, the apparatus including: a first optical coupler configured to be coupled to a first tubular section and configured to be in optical communication with the first device using a first optical transmission medium disposed at the first tubular section; and a second optical coupler configured to be coupled to a second tubular section and configured to be in optical communication with the second device using a second optical transmission medium disposed at the second tubular section; wherein the first optical coupler is configured to be perimetrically disposed about the second optical coupler to be in communication with the second optical coupler to provide the communications between the first device and the second device.

Abstract: A system for transmitting an optical signal between a host and a device according to a SATA protocol. The system comprises a transmitting-side converter for generating a logic one voltage value responsive to a data one value from an information source, for generating a logic zero voltage value responsive to a data zero value from the information source, for generating an idle state logic voltage value, wherein the idle state logic voltage value is (logic one voltage value+logic zero voltage value)/2, the transmitting-side converter comprising only linear functions to preserve the idle state logic voltage value, and an electrical-to-optical converter for converting the logic one, logic zero and the idle state logic voltage values to an optical signal further comprising respective logic one, logic zero and idle state optical values and for supplying the optical signal to an optical communications medium.

Abstract: An apparatus includes an optical Input/Output (I/O) connector, which has a central axis that is mounted in a plane and which is configured to connect to external optical fibers for transferring input optical signals to the apparatus and output optical signals from the apparatus. A first optical ferrule is mounted perpendicularly to the optical I/O connector in the plane, and is configured to transfer the input optical signals from the optical I/O connector to respective optical detectors. A second optical ferrule is mounted perpendicularly to the optical I/O connector in the plane, and is configured to transfer the output optical signals from respective optical emitters to the optical connector. A light rotation module is configured to bend and transfer the input and output optical signals between the optical I/O connector and the perpendicularly-mounted first and second optical ferrules.

Abstract: A data transmission system includes a first electronic device, a second electronic device, and a detachable optical data cable. The first electronic device and the second electronic device, both include a processor. The optical data cable includes a first connecting member, a second connecting member, and a signal transmitting cable. The first connecting member includes a first photoelectric conversion module, and the second connecting member includes a second photoelectric conversion module. The optical signal transmitting cable includes an optical fiber and an electrical wire. The optical fiber connect with the two photoelectric conversion modules. The processor of the first electronic device includes an electrical power emitting module, for emitting electrical power from the first electronic device to the second inserting port via the electrical wire of the optical data cable, to start the second photoelectric conversion module. The present disclosure further provides an optical data cable.

Abstract: A system and method for carrying a downstream optical signal and an upstream optical signal on a fiber optic link is disclosed. The system and method includes a first transceiver unit that receives an input communication signal from at least one external communication device at an electrical input port, a transmitter that converts the input communication signal into an optical signal and transmits the optical signal as an downstream optical signal on a fiber optic link, a receiver at the second transceiver unit that receives the downstream optical signal and converts the downstream optical signal into an electrical communication signal, and a first circuit in the second transceiver unit that determines whether the second transceiver couples the electrical communication signal to a two wire intercom circuit or a four wire intercom circuit.

Abstract: Herein disclosed a digital image sender for transmitting a digital image signal including image signals for color image reproduction, a reference clock signal and parallel control signals, including: a parallel/serial converter configured to convert the parallel control signals into a serial control signal by time division multiplexing; a superposition element configured to superpose the serial control signal obtained by the conversion by said parallel/serial converter on the reference clock signal and output a resulting superposition signal; and an electro-optic converter configured to convert the superposition signal outputted from said superposition element from an electric signal into an optical signal.

Abstract: The present disclosure includes a digital communication method and system for use in telephone exchanges, wireless and wired communication systems. The communication system uses hybrid wireless switches where communication links are established and data is transferred via modulated electron beams. The electron beams are controlled by electromagnetic field to target a specific output channel according to a unique identifying signature. The switch can concurrently process data from multiple users and supports half-duplex or full-duplex allowing receiving and transmitting data at the same time. The switch can concurrently communicate with other switches, stationary stations, and with mobile stations. The wireless switch can also act as a multiplexer and demultiplexer to connect users in a communication system or to transfer data, video and audio signals to subscribers from wireless, satellite, or local area networks.

Abstract: Systems and methods for modulating light with light in high index contrast waveguides clad with graphene. Graphene exhibits a large nonlinear electro-optic constant ?3. Waveguides fabricated on SOI wafers and clad with graphene are described. Systems and methods for modulating light with light are discussed. Optical logic gates are described. Waveguides having closed loop structures such as rings and ovals, Mach-Zehnder interferometer, grating, and Fabry-Perot configurations, are described. Optical signal processing methods, including optical modulation at Terahertz frequencies, are disclosed. Optical detectors are described. Microelectromechanical and nanoelectromechanical systems using graphene on silicon substrates are described.

Abstract: Disclosed herein is a single wavelength bi-directional optical transceiver for transmitting/receiving optical signals having the same wavelength through an optical communication system. The optical transceiver includes a transmitter including an isolator and converting an external input signal into an optical transmit signal, an optical filter reflecting some of the optical transmit signal and transmitting the other of the optical transmit signal, an optical fiber transmitting the optical transmit signal transmitted by the optical filter to a counterpart optical transceiver, a receiver receiving an optical receive signal from the counterpart optical transceiver via the optical fiber, and a body enclosing a portion of the transmitter, the optical filter, a portion of the optical fiber and a portion of the receiver.

Abstract: A memory expanding device for expanding a main memory of an external device connected to the memory expanding device through an optical interface.

Abstract: Various embodiments of the present invention are directed to methods and systems for transmitting optical signals from a source to a plurality of receiving devices. In one method embodiment, an optical enablement signal is transmitted from the source to the plurality of receiving devices. The target receiving device responds to receiving the optical enablement signal by preparing to receive one or more optical data signals. The source transmits the one or more optical data signals to the target receiving device. The remaining receiving devices do not receive the one or more optical data signals.

Abstract: An optical transmission system includes at least a first optical link to transmit a first data signal as a part of a multi-lane signal and a second optical link to transmit a second data signal as another part of the multi-lane signal; on the transmission side, a reference clock is constantly applied to the first data signal of the first optical link, and a delay clock is applied to the second data signal responsive to a control signal on the second optical link; on the receiving side, the phase of a first clock signal detected from the first data signal received on the first optical link and the phase of a second clock signal detected from the second data signal received on the second optical link are compared, and the control signal is detected from the comparison result.

Abstract: According to a first aspect, techniques are provided to optimize a Mach-Zehnder modulator drive waveform by distorting the outer modulation levels of the waveform, thereby equalizing eye openings of the received optical field, and in particular creating a wider and more defined central eye opening of the received optical field. According to a second aspect, techniques are provided to adjust in-phase (I) modulation levels based on the imperfect performance of a Mach-Zehnder modulator allocated to modulate quadrature-phase (Q) modulation levels, and conversely to adjust the Q modulation levels based on the imperfect performance of an MZ modulator allocated to modulate I modulation levels.

Abstract: The present invention relates to a method for determining a signaling set, comprising: selecting a first basis function in the form of a symmetric pulse represented by an even function; selecting a second basis function orthogonal to the first basis function; wherein the second basis function is represented by an odd function having a shape determined by a variable parameter; and determining a signaling set comprising a plurality of data signals formed by linear combinations of the first and second basis functions based on a predetermined requirement of the signaling set. The invention also relates to a modulation and demodulation method using the signaling set, a device performing the modulation and demodulation method and to a system incorporating such a device.

Abstract: Tunable resonator systems and methods for tuning resonator systems are disclosed. In one aspect, a resonator system includes an array of resonators disposed adjacent to a waveguide, at least one temperature sensor located adjacent to the array of resonators, and a resonator control electronically connected to the at least one temperature sensor. Each resonator has a resonance frequency in a resonator frequency comb and channels with frequencies in a channel frequency comb are transmitted in the waveguide. Resonance frequencies in the resonator frequency comb are to be adjusted in response to ambient temperature changes detected by the at least one temperature sensors to align the resonance frequency comb with the channel frequency comb.

Abstract: A communication network is described in which a number of computing nodes are situated in a logical multidimensional array and are linked by communication cables. The communication cables carry conduits connecting each node with all other nodes in the array so that a direct physical connection exists between every pair of computing nodes in the array. A method of providing interconnection among nodes in a communication network comprises arranging and connecting computing nodes in an array as described above, where each node passively redirects conduits to columns and rows in the array.

Abstract: A data transmission system is provided with a transmission unit, a receiving unit, transmission paths, and a delay unit. The delay unit is disposed on a transmission path along which a high-speed signal is transmitted, and delays the transmission of the high-speed signal with respect to a low-speed signal. When the high-speed signal is transmitted from a section b2 to c along the transmission path, a delay time of ?t occurs with respect to when the high-speed signal is transmitted from a section a to b1 along the transmission path. In other words, the phase of the high-speed signal transmitted from section b2 to c is shifted with respect to the phase of the high-speed signal transmitted from section a to b1. Consequently, a time interval in which an EMI peak value occurs can be reduced, thereby enabling the probability of an EMI peak value occurring to be reduced.

Abstract: Devices, systems and methods for run-time reassignment of the interconnection between devices pertaining to a Physical (PHY) layer and devices pertaining to a Media Access Control (MAC) layer, with no packet loss or with at most one packet lost are provided. The strategies employed by these devices, systems and methods used REMOTE FAULT, PAUSE and IDLE PATTERN messages. The devices may be interconnected via a reconfigurable optical crossbar.

Abstract: An embodiment of an apparatus includes an optical fiber for which a complete orthogonal basis of propagating modes at an optical telecommunication frequency includes ones of the propagating modes with different angular momenta. The optical fiber has a tubular optical core and an outer optical cladding in contact with and surrounding the tubular optical core. The tubular optical core has a larger refractive index than the optical cladding. The tubular optical core is configured such that those of the propagating modes whose angular momenta have the lowest magnitude for the propagating modes have substantially the same radial intensity profile.

Abstract: An electronic system includes a plurality of electronic nodes, each having a transmitter module and a plurality of receiver modules, in which the transmitter module is positioned at a same location with respect to the receiver modules in each of the electronic nodes, and a plurality of fanout optical buses, each fanout optical bus comprising a transmitter section, a plurality of receiver sections, and at least one substantially straight optical waveguide extending between the plurality of receiver sections, wherein each transmitter section is optically connected to a transmitter module of a respective one of the electronic nodes and wherein the receiver sections of each of the fanout optical buses is connected to respective ones of the receiver modules of the electronic nodes.

Abstract: According to one embodiment of the invention, fiber optic communications method is described. The method comprises a first operation of dynamically identifying frequencies at which spectral nulls occur in a signal received via an optical fiber, and thereafter, segregating communications over the optical fiber into a set of inter-null bands defined by the spectral nulls.

Abstract: It is determined that service is to be disconnected for at least a first subscriber of a video content network employing at least one fiber optic cable. The service to the at least first subscriber is provided from a cross-connect cabinet, over the at least one fiber optic cable, to a premises of the at least first subscriber. Sufficient macro-bending loss is induced in the at least one fiber optic cable so as to cause a signal-to-noise ratio at the premises to degrade such that the service is disconnected. The macro-bending loss is induced in a portion of the at least one fiber optic cable which services only the first subscriber. The macro-bending loss can be induced, for example, by winding about a single mandrel, two mandrels in a figure eight pattern, in a tortuous groove in a tray, and so on.

Abstract: Intrapersonal communication systems and methods that provide an optical digital signal link between two or more local devices are disclosed. In some embodiments, the system includes a first signal converter disposed at a first end of the optical digital signal link and configured to convert between electrical digital signals from a first local device and optical digital signals from the optical digital signal link. The system can include an optical connector having a non-contact portion configured to couple optical digital signals between the first signal converter and the optical digital signal link across a gap. The system can include a second signal converter disposed at a second end of the optical digital signal link and configured to convert between electrical digital signals from the second local device and optical digital signals from the optical digital signal link.

Abstract: A quantum communication system, said system comprising: an emitter configured to send signal light pulses having a first intensity and decoy light pulses having a second intensity to a receiver, wherein information is encoded on said signal pulses; a controller configured to set the distribution of signal pulses and decoy pulses and the intensity of the signal pulse such that the maximum average secure bit rate is achieved over the range of potential drift in the decoy pulse intensity during use of the system, while maintaining a non-zero secure bit rate over the range of potential drift in the decoy pulse intensity during use of the system.

Abstract: An optical beam splitter for use in an optoelectronic module and method are provided. The optical beam splitter is configured to split a main beam produced by a laser into at least first and second light portions that have different optical power levels. The first light portion, which is to be coupled into an end of a transmit optical fiber of an optical communications link, has an optical power level that is within eye safety limits and yet has sufficient optical power to avoid signal degradation problems. The optical power level of the first light portion is less than the optical power level of the second light portion. The optical beam splitter is capable of being implemented in a unidirectional or a bidirectional optical link.

Abstract: This disclosure is directed to optical data path systems that enable unidirectional and bidirectional transmission of optical signals between nodes of a multi-node system such as a multiprocessor system. In one aspect, an optical data path system includes an optical device layer connected to nodes of a multi-node system and a controller. The optical device layer includes a waveguide network of waveguide branches optically connecting each node of the multi-node system to every other node of the multi-node system, resonators disposed adjacent to the waveguide branches, and detectors disposed adjacent to waveguide branches of the waveguide network. Each detector is electronically connected to a node of the multi-node system. The resonators are operated by the controller to control the path of optical signals sent between the nodes of the multi-node system.

Abstract: An equaliser (200) for equalisation of a signal transmitted via an optical fibre link from a transmitter to a corresponding receiver employs a backpropagation model (300) which comprises one or more sequential segments collectively representing an inverse fibre link. Each sequential segment comprises a linear backpropagation element (304), and a non-linear backpropagation element (306) having an associated compensation bandwidth (312). The equaliser (200) generates a distortion-mitigated signal by computing, for each sequential segment in turn, a first linear compensated signal from a signal input to the segment in accordance with the linear backpropagation element (304), and a non-linear compensated signal from the first linear compensated signal in accordance with the non-linear backpropagation element (306).

Abstract: A serializer is equipped with a plurality of input terminals into which a plurality of binary signals are input in parallel, and converts the plurality of input binary signals into serial binary signals and transmits the serial binary signals to an optical transmission module. One input terminal out of the plurality of input terminals is assigned as an input terminal for preventing bit continuation by inserting “1” signals or “0” signals into the serial binary signals so that a predetermined number of bits of the same value may not be inserted continuously. Due to this structure, bit continuation can be prevented even for a signal generating source with no coding function by a simple configuration without increasing cost and size.

Abstract: Distortion of a reception signal which is attributable to interference between subcarriers during photoelectric conversion is reduced in an optical OFDM communication system without broadening the signal band. A transmission signal processing unit (100) in a transmitter is provided with a distortion generating circuit (distortion generating unit) (170). A subcarrier signal is utilized as an input signal for the circuit. The distortion generating circuit (170) generates a baseband OFDM signal by means of inverse FFT calculation using the input signal, computes the square of the absolute value of the signal, and restores the subcarrier signal by mean of FFT calculation. Because interference between subcarriers is also included in the signal, the distortion element generated by the interference between the subcarriers can be extracted when the difference from the input signal is found.

Abstract: A light transmission module includes an optical converter for converting an electrical signal to an optical signal; a light transmission path for transmitting the optical signal converted by the optical converter; an electrical transmission path for transmitting an input electrical signal; and a control instructing unit for instructing stop of drive to the optical converter based on a detection of an input electrical signal. When an input electrical signal having a predetermined frequency is detected, the input electrical signal having the predetermined frequency is converted to an optical signal and transmitted in the light transmission path. When input of an electrical signal other than the predetermined frequency is detected, the electrical signal other than the predetermined frequency is transmitted by the electrical transmission path without being converted to an optical signal due to the stop of the drive of the optical converter.

Abstract: An all-optical modulation format converter for converting optical data signals modulated in an on-off-keying (OOK) format to a phase-shift-keying (PSK) format. The OOK-to-PSK converter can be coupled to a delay-line interferometer to provide an all-optical wavelength converter for differential PSK (DPSK). The OOK-to-PSK converter can also be used in all-optical implementations of various functions, including, for example, exclusive-OR (XOR/NXOR) and OR logic, shift registers, and pseudo-random binary sequence (PRBS) generators. Several variants of all-optical devices are described.

Abstract: A semiconductor laser drive apparatus comprises a bias current setting section (232) which sets a bias current value on the basis of the drive temperature so that the temperature characteristic of the bias current value with respect to the drive temperature may be a linear function having a slope except zero and a drive current setting section (233) for setting the drive current value on the basis of the drive temperature so that the temperature characteristic of the drive current value with respect to the drive temperature may be a function having a slope except zero. The temperature characteristic of the bias current and that of the drive current are functions different from each other. With this, low cost, space-saving, and power-saving of a semiconductor laser are achieved, and a semiconductor laser drive apparatus enabling a good transmission characteristic on the reception side and a high optical output over the whole drive temperature range when driving the semiconductor laser can be provided.

Abstract: A combined optical and electrical transmission assembly includes a combined optical, electrical and power cable having an optical fiber, electrical wiring and a power line combined therein or a combined optical and electrical cable having an optical fiber and electrical wiring combined therein, and a combined optical and electrical transmission module that includes an electrical-to-optical conversion unit having a laser for converting electrical signals to optical signals and a driving IC for driving the laser, and/or an optical-to-electrical conversion unit having a photodiode for converting optical signals to electrical signals and an amplification IC for amplifying electrical signals from the photodiode. The combined optical and electrical transmission module is connected to both ends of the combined optical, electrical and power cable or the combined optical and electrical cable.

Abstract: The present disclosure provides systems and methods for channel power offsets for multi-rate dense wave division multiplexed (DWDM) transmission over optical add-drop multiplexers (OADMs). The present invention includes algorithms to set power levels of each type of channel in different sections of a fiber system to optimize the performance of that type of channel at the receiver. For example, the present invention can optimize power levels based on different channel modulation formats, bit rates, channel spacings, and the like. Advantageously, the present invention improves the total capacity (bit rate) and reach that channels of a given bit rate can achieve, and maximizes the reach of channels without sacrificing capacity.

Abstract: A phase shift keyed demodulator includes first and second beam splitters, a first optical path, a second optical path, and a wavelength tuner. The first beam splitter splits an input signal into first and second output signals. The second beam splitter splits each first and second output signal into a transmitted signal and a reflected signal. The first optical path includes an optical path of each transmitted signal from a beam splitting surface to a reflector and back to the beam splitting surface. The second optical path includes an optical path of each reflected signal from the beam splitting surface to a mirror surface and back to the beam splitting surface. A path difference introduces a delay between the transmitted signal and the reflected signal. The wavelength tuner tunes the demodulator to a predetermined central wavelength and introduces a phase shift between first and second transmitted signals.

Abstract: An optical access network that connects customers to a core network, the access network comprising: a different Optical Network Unit (ONU) connected to each customer; a different head-end device for each ONU that receives data from the core network intended for the ONU and configures the data for transmission to the ONU in accordance with a passive optical network (PON) protocol; and an optical fiber that connects the head-end device to the ONU.

Abstract: A device other than a projectile including: a casing, at least a portion of which contains a potting material acting as the optical waveguide material; a transmitter for transmitting a pulse based signal at least partially through the potting material; and a receiver for receiving the pulse based signal after one or more reflections of the pulse based signal from interior surfaces of the casing; the pulse based signal having a pulse rate configured such that a subsequent pulse doesn't interfere with reflections from an immediately previous pulse.

Abstract: A node is configured to receive an instruction to establish a channel having a bandwidth that corresponds to an operating spectrum an optical fiber; obtain information that identifies a channel spacing and a pointer that identifies where, within the spectrum, to establish bandwidth allocations; identify a group of bandwidth segments based on the spectrum and the channel spacing; and generate bit words that correspond to the bandwidth allocations, where the bit words includes bits that, when set to a value, cause sets of segments to be reserved within the spectrum, and where the sets of segments identify where the bandwidth allocations begin and end, within the spectrum, relative to the pointer.

Abstract: An optical phase modulator based on the principles of stimulated Brillouin scattering is disclosed. The optical phase modulator uses a pump wave and a probe wave counte-propagating in an optical fiber, whose frequencies are chosen such that a difference thereof differs from a resonant Brillouin frequency of the optical fiber. The pump wave is amplitude modulated prior to injecting into the optical fiber, causing phase modulation of the probe wave inside and at the exit from the optical fiber. Alternatively, the probe wave can be amplitude modulated, thereby causing a phase modulation of the pump wave. In the embodiments of the invention, the pump wave is a continuous wave, and the probe wave is a pulse Stokes wave or an anti-Stokes wave. A corresponding optical network using the phase modulator is also disclosed.

Abstract: A hybrid circuit for producing optical signals in response to electrical energizing signals, including: a tilted charge light-emitting device having an electrical input port and an optical output port, the device having an optical output response which is a function of input frequency; and an input interface circuit coupled with the electrical input port of the device, and having a transfer function substantially proportional to an inverse of the optical output response of the device; whereby application of the electrical energizing signals to the input interface circuit is operative to produce optical signals from the output optical port of the device. The input interface circuit includes a passive RLC circuit having a transfer function characterized by a region of increasing amplitude versus frequency.

Abstract: An optical communication module includes an optical package including at least one semiconductor optical device, an optical filter for reflecting light of a specific wavelength and transmitting light of an other wavelength, an optical block including a transparent material and the optical filter, a housing that houses the optical package and the optical block, an in-housing circuit board housed in the housing and mounting a peripheral electrical circuit for the optical package thereon, and an electrical connector electrically connected to the in-housing circuit board and exposed at a bottom surface of the housing. The optical block further includes a front lens portion at a front side face of the housing, a rear lens portion at a rear side face of the housing, a light inputting port, and a light outputting port. The optical filter is arranged to obliquely intersect with an optical axis passing through the front lens portion and the rear lens portion at a predetermined angle.

Abstract: A communications device includes a transmitter device having first and second optical sources and generating respective first and second modulated optical carrier signals at first and second optical carrier frequencies based upon an input signal. The communications device also includes an optical waveguide coupled to the transmitter device, and a receiver device coupled to the optical waveguide and including an FM-PM discriminator having a transfer function with a positive slope portion and a negative slope portion so that the first optical carrier frequency is positioned on the positive slope portion and the second optical carrier frequency is positioned on the negative slope portion.

Abstract: An opto-electric hybrid module capable of shortening the distance between a light-emitting section or a light-receiving section of a semiconductor chip and a reflecting surface formed in a core to reduce optical losses between an opto-electric conversion substrate section and an optical waveguide section, and a method of manufacturing the same. A recessed portion (3a) is formed in a surface of an over cladding layer (3) of the optical waveguide section (W1). At least part of the light-emitting section (7a) or the light-receiving section of the semiconductor chip (7) for opto-electric conversion and at least part of a loop portion (8a) of a bonding wire (8) in the opto-electric conversion substrate section (E1) are positioned within the recessed portion (3a). This brings the light-emitting section (7a) or the light-receiving section of the semiconductor chip (7) and the reflecting surface (2a) formed in the core (2) closer to each other.