Abstract: A sourceless co-packaged optical-electrical chip can include a plurality of different optical transceivers, each of which can transmit to an external destination or internal components. Each of the transceivers can be configured for a different modulation format, such as different pulse amplitude, phase shift key, and quadrature amplitude modulation formats. Different light sources provide light for processing by the transceivers, where the light source and transceivers can be configured for different applications (e.g., different distances) and data rates. An optical coupler can combine the light for the different transceivers for input into the sourceless co-packaged optical-electrical chip via a polarization maintaining media (e.g., polarization maintaining few mode fiber and polarization maintaining single mode fiber), where another coupler operates in splitting mode to separate the different channels of light for the different transceivers according to different co-packaged configurations.

Abstract: An active optical cable is disclosed. According to the present disclosure, there is provided an active optical cable, having no complicated structure by obviating the need for a separate monitoring photodetector as was used for a typical optical transceiver, increasing light output-current linearity to improve optical coupling efficiency, generating a library of transmission/reception-related electro-optical characteristics of both optical modules so as to enable light outputted from a light source included in an optical transmitter to maintain high linearity over a wide range of temperatures, thereby reducing power consumption, and being applicable to a multi-level PAM technique involving at least four (4) levels.

Abstract: An active optical cable (AOC) is disclosed. According to the present disclosure, an AOC, when connected to a network equipment, generates, changes or deletes and then transmits new information necessary for the a network equipment to recognize and operate the AOC itself, and thereby enabling a data center provided with the AOC and the network equipment to perform data communication smoothly without failure.

Abstract: An active optical cable is disclosed. According to the present disclosure, there is provided an active optical cable, characterized by: having no complicated structure by obviating the need for a separate monitoring photodetector as was used for a typical optical transceiver, increasing light output-current linearity to improve optical coupling efficiency, generating a library of transmission/reception-related electro-optical characteristics of both optical modules so as to enable light outputted from a light source included in an optical transmitter to maintain high linearity over a wide range of temperatures, thereby reducing power consumption, and being applicable to a multi-level PAM technique involving at least four (4) levels.

Abstract: A fiber optic sensing system. The fiber optic sensing system includes an optical source adapted to provide an optical signal at a plurality of wavelengths. The fiber optic sensing system also includes a plurality of wavelength taps for separating the optical signal into signal portions at each of the plurality of wavelengths. The fiber optic sensing system further includes a plurality of optical sensors, each of the optical sensors configured to receive one of the signal portions at a respective one of the plurality of wavelengths. The fiber optic sensing system still further includes a plurality of wavelength combiners for combining signal portions from the plurality of optical sensors into a recombined signal. Also included in the fiber optic sensing system is an optical receiver for receiving the recombined signal. The fiber optic sensing system also includes an optical fiber path between the optical source and the optical receiver.

Abstract: A sensing apparatus includes: a broadband optical source; a first pseudorandom number generator generating a first pseudorandom number code string to modulate the broadband optical source; at least one sensor reflecting an output of the first pseudorandom number generator at a wavelength corresponding to a center wavelength thereof when the output of the first pseudorandom number generator is inputted; a wavelength-time converter converting an output of the sensor by wavelength-time conversion; a second pseudorandom number generator generating a second pseudorandom number code string which is different in frequency from and is the same in bit length and code string as the first pseudorandom number code string; a mixer mixing an output signal of the wavelength-time converter with an output signal of the second pseudorandom number generator; and an integrator integrating an output of the mixer.

Abstract: An optical transceiver apparatus includes a gain medium, a photoelectric converter, at least one AWG, and a partial reflection mirror. The at least one AWG includes two common ports and multiple branch ports. One of the two common ports functions as a signal sending port, and the other functions as a signal receiving port, where bandwidth of the signal sending port is less than that of the signal receiving port. The gain medium and the photoelectric converter are connected to one of the branch ports of the AWG. The AWG and the partial reflection mirror are configured to cooperatively perform wavelength self-injection locking on an optical signal provided by the gain medium, and output the optical signal through the signal sending port. The AWG is further configured to demultiplex an optical signal received by the signal receiving port to a branch port. A WDM-PON system is also provided.

Abstract: Methods of forming microelectronic structures are described. Embodiments of those methods may include forming a photomask on a (110) silicon wafer substrate, wherein the photomask comprises a periodic array of parallelogram openings, and then performing a timed wet etch on the (110) silicon wafer substrate to form a diffraction grating structure that is etched into the (110) silicon wafer substrate.

Abstract: An optical de-multiplexer (de-MUX) that includes an optical device that images and diffracts an optical signal using a reflective geometry is described, where a free spectral range (FSR) of the optical device associated with a given diffraction order abuts FSRs associated with adjacent diffraction orders. Moreover, the channel spacings within diffraction orders and between adjacent diffraction orders are equal to the predefined channel spacing associated with the optical signal. As a consequence, the optical device has a comb-filter output spectrum, which reduces a tuning energy of the optical device by eliminating spectral gaps between diffraction orders of the optical device.

Abstract: An electro-optical device includes an optical de-multiplexing portion operative to output a first optical signal having a first wavelength and a second optical signal having a second wavelength, an array of photodetectors, and a switching logic portion communicatively connected to the array of photodetectors, the switching logic portion operative to determine which photodetector of the array of photodetectors is converting the first optical signal into a first electrical signal and output the first electrical signal from a first output node associated with the first optical signal.

Abstract: Consistent with the present disclosure, an optical communication system, such as a passive optical network (PON), is provided that includes an optical line terminal (OLT) and a plurality of optical network units (ONUs). The OLT includes a plurality of photonic integrated circuits that have both optical transmitters and receivers provided therein. Accordingly, the OLT may have fewer components and a simpler, more reliable and cost-effective design than a conventional OLT including discrete components. In addition, various ONU configurations are provided that also have a simple design and fewer components. Thus, ONUs consistent with the present disclosure may also have reduced costs.

Abstract: The invention provides an optical device, including a light-transmissive substrate, and a pair of different, parallel gratings including a first grating and second grating, located on the substrate at a constant distance from each other, each of the pair of parallel gratings including at least one sequence of a plurality of parallel lines, wherein the spacings between the lines gradually increase from one edge of the grating up to a maximum distance between the lines, and wherein the arrangement of lines in the second grating is in the same direction as that of the first grating. A system utilizing a plurality of such optical devices is also disclosed.

Abstract: An optical transmission system includes a plurality of optical nodes that transmits wavelength multiplexing light including a plurality of signal light components having different wavelengths, wherein each of the optical nodes includes superimposed signal light generation circuit which superimposes a low frequency signal having a common frequency on a corresponding signal light component included in the wavelength multiplexing light; low frequency signal extraction circuit which extracts a low frequency signal having a frequency of a given range from a corresponding signal light component; and pass-through node number measurement circuit which measures, for each of the signal light components, a pass-through node number based on the frequency of the low frequency signal extracted by the low frequency signal extraction circuit, the pass-through node number being the number of optical nodes through which the signal light component has passed before being transmitted to a specific optical node.

Abstract: An optical ring network architecture including a number (N) of multi-add/drop filters, such as filters formed using pairs of frequency routers. Each multi-add/drop filter is coupled to two other multi-add/drop filters using N-2 transmission media, such as optical fibers, to form a ring. The network includes a number (N) of terminal stations associated with the multi-add/drop filters. A terminal station (p) is coupled with, and receives information from, its associated multi-add/drop filter (p) through a single optical fiber. The terminal station p is coupled with, and transmits information in a first direction around the ring to, a multi-add/drop filter p+1 through a single optical fiber. Communications from terminal station p to each other terminal station in the first direction are assigned one of N-1 wavelengths where no two wavelengths on a given optical fiber are associated with communications between terminal stations in the same direction.

Abstract: The present invention provides a wavelength-switched reconfigurable optical add-drop multiplexer (R-OADM) with wavelength broadcasting capability, such that asymmetric video signal distribution and the like can be performed without sacrificing with respect to component complexity and expense. The present invention utilizes an optical splitting and combining device with the wavelength-switched R-OADM to allow the R-OADM to support network-wide wavelength broadcasts without requiring external regeneration and extra optical transceiver equipment.

Abstract: Embodiments herein include a resilient add-drop module for use in one of multiple access subnetwork nodes forming an access subnetwork ring. The module comprises a dual-arm passive optical filter and a cyclic arrayed waveguide grating (AWG). The dual-arm passive optical filter is configured to resiliently drop any wavelength channels within a fixed band uniquely allocated to the access subnetwork node from either arm of the access subnetwork ring and to resiliently add any wavelength channels within the fixed band to both arms of the access subnetwork ring. The cyclic AWG is correspondingly configured to demultiplex wavelength channels dropped by the dual-arm filter and to multiplex wavelength channels to be added by the dual-arm filter. Configured in this way, the module in at least some embodiments advantageously reduces the complexity and accompanying cost of nodes in an optical network, while also providing resilience against fiber and node failures.

Abstract: An optical device for optically multiplexing or demultiplexing light of different predetermined wavelengths is provided, the optical device comprising at least one first waveguide (11) and at least one second waveguide (12) formed on a substrate (10), wherein the at least one first waveguide and the at least one second waveguide intersect at an intersection, comprising a diffraction grating structure (13) formed at the intersection. There exists a first wavelength or wavelength band travelling within the first waveguide (11) exciting the grating structure and being diffracted an angle corresponding to an outcoupling direction and there exists a second wavelength or wavelength band, different from the first wavelength or wavelength band, travelling within the second waveguide (12) exciting the grating structure and being diffracted at an angle corresponding to the same outcoupling direction.

Abstract: New designs of optical devices, particularly for dropping a selected wavelength or a group of wavelengths as well as demultiplexing a multiplexed signal into several signals, are disclosed. An optical device employs thin film filters with reflectors to reassemble as a fiber Bragg grating. Depending on implementation, a reflector may be a mirror or a coated substrate disposed in a unique way to reflect a light beam from a filter back to a common port of a device. The reflector may also be coated accordingly to bypass a certain portion of the light beam for other purposes. As a result, the optical devices so designed in accordance with the present invention are amenable to small footprint, enhanced impact performance, lower cost, and easier manufacturing process.

Abstract: ROADM node systems and methods of operation are disclosed. ROADM node systems may include transponder aggregators including transponders to add signals for switching through the ROADM node. The transponder aggregators may be constrained from adding signals on adjacent channels for simultaneous use. Further, the transponder aggregators may include an optical coupler in lieu of an optical multiplexer. The ROADM system may include a set of wavelength selective switches associated with output ports that can provide an additional filtering function for the added signals prior to transmission on a WDM network.

Abstract: An optical multiplexer/demultiplexer is described. In this optical multiplexer/demultiplexer, multiple coupled-waveguide grating devices are optically coupled to a bus optical waveguide. A given coupled-waveguide grating device has a band-pass filter characteristic that encompasses multiple optical channels, thereby providing coarse optical filtering. Moreover, the optical multiplexer/demultiplexer includes multiple add/drop filters (such as ring resonators) that optically couple to the coupled-waveguide grating devices. A given add/drop filter has a filter bandwidth corresponding to a given optical channel, thereby providing fine optical filtering. Furthermore, the band-pass filter characteristic of the given coupled-waveguide grating device is approximately equal to or less than a free spectral range (FSR) of the given add/drop filter.

Abstract: A dynamic gain equalizer-monitor (DGEM) includes a light modulator operable to modulate one or more component wavelengths of an input optical signal. The DGEM also includes a grating operable to receive one or more modulated component wavelengths from the light modulator. The grating is also operable to combine a first portion of each of the one or more modulated component wavelengths and transmit that first portion into an output optical signal. The DGEM may also include a detector array operable to receive, from the grating, a second portion of modulated component wavelengths that are separated from the first portion by the grating. The detector array is operable to generate an electrical signal proportional to an optical characteristic associated with each of the modulated component wavelengths of the second portion.

Abstract: Channel power management may be achieved in a branched optical communication system such that uniform loading is provided across branch channels on a branch drop path without passing information signals that are not intended for the branch terminal to the branch drop path. In general, a system and method consistent with the present disclosure reuses one or more loading signals (e.g., noise bands) from the branch add path to maintain uniform loading in the branch drop path of the same branch. The system and method thus prevents trunk channels from being dropped to a branch terminal when those trunk channels are not intended for the branch terminal.

Abstract: In a method and system for providing dispersion compensation in an optical system, there is coupled into the optical system at least one pathway into which there is connected a tunable chirped fiber Bragg grating, each such grating providing a respective tunable amount of dispersion. At least one respective DGD element is connected into the respective pathway for each such grating. The set of all such respective DGD elements in a given pathway introduces a bias differential group delay DGD(bias) having an absolute value that, for at least one tuning value of the grating, is substantially equal to differential group delay introduced by the grating.

Abstract: An optical switching and delay system for optical encryption and/or optical decryption may comprise a switch bank, a set of optical delay lines, a combiner, and a processor. The switch bank may be configured to receive an optical signal in a first arrangement and route the optical signal to the set of optical delay lines according to a switching arrangement key. The set of optical delay lines may be configured to provide delays to the optical signal. The combiner may be configured to receive the optical signal with delays from the set of optical delay lines and combine the optical signal into a second arrangement. The processor may be configured to receive the switching arrangement key and control the switch bank according to the switching arrangement key. The switching arrangement key may comprise a set of instructions for routing the optical signal.

Abstract: There is provided a filter assembly for combining a wavelength multiplexed optical signal by multiplexing optical signals of different wavelength emitted from respective optical devices, and/or for dividing a wavelength multiplexed optical signal into optical signals of different wavelength and causing the optical signals of different wavelength to enter respective optical devices. This filter assembly comprises: a light transmitting member within which each optical signal propagates; plural optical filters disposed on an upper face of the light transmitting member at a predetermined spacing wherein each optical signal passes through the optical filters; upper reflective layers respectively provided between adjacent ones of the optical filters; and a lower reflective layer provided on a lower face of the light transmitting member, and wherein the wavelength multiplexed optical signal propagates along the same optical path within the light transmitting member.

Abstract: An optical communication system including an optical communication fiber and a plurality of modules. Each of the modules has an optical transceiver that is optically coupled to the optical communication fiber by a corresponding optical drop. And each of the transceivers is configured for transmitting and/or receiving one or more optical signals via the optical communication fiber. The optical signals represent a plurality of individual data streams formatted according to one or more different communication protocols. In this manner, optical communication is enabled among the modules via the optical communication fiber.

Abstract: Where add optical signals have k different bit rates, an add controller is connected to k (<N) of N input ports and sends the add optical signals to the k input ports to perform add control. A drop controller is connected to m (<M) of M output ports and performs drop control on optical signals from the m output ports. The k input ports of an N×M wavelength selective switch and the add controller are connected by k links (L1 to Lk) which have introduced therein dispersion compensators for compensating chromatic dispersions of the add optical signals with the respective bit rates. The add controller selects a link through which an add optical signal is to be passed for dispersion compensation, and sends the signal to the N×M wavelength selective switch via the selected link.

Abstract: The general field of the invention is that of fiber-optic sensors comprising at least one measurement optical fiber having an optically pumped doped amplifying medium, the optical characteristics of which are sensitive to a physical quantity, the fiber having at least one Bragg grating. The fiber is designed so as to generate, in the amplifying medium, two optical waves having different optical frequencies that propagate in the same direction after reflection on the Bragg grating and are emitted by the amplifying medium, the two optical frequencies depending on the physical quantity. The two waves may be generated using either a birefringent polarization-maintaining fiber or a DBR (Distributed Bragg Reflector) laser cavity. Notably, this sensor may be used as a hydrophone.

Abstract: A wavelength selective switch for suppressing degradation of pass band characteristics when the temperature rises. The wavelength selective switch includes a spectroscopic element for separating input light and providing angular dispersion depending on wavelengths, a collective lens for gathering light output from the spectroscopic element, and a movable reflection block which includes a plurality of mirrors arranged in the direction of angular dispersion made by the spectroscopic element, changes the angles of the mirrors in a direction differing from the direction of angular dispersion, and reflects the light coming from the collective lens. The collective lens is fixed at one end with respect to the direction of angular dispersion, expands with heat in a direction in which it is not fixed when the temperature rises, and outputs the light in a direction opposite to the direction in which the angle of light output from the spectroscopic element changes.

Abstract: An optical network component, architecture and method for a wavelength division multiplexed passive optical network includes a band coupler configured to demultiplex first and second wavelength division multiplexed content transmitted from an optical line terminal into a first band signal and a second band signal. An arrayed wavelength grating is configured to receive the first band signal and to further demultiplex the first band signal into different wavelengths to provide a plurality of wavelength signals. An optical splitter is configured to split the second band signal into sub-signals and multiplex the sub-signals with each of the wavelength signals such that the first and second wavelength division multiplexed content is provided on a single wavelength to a user.

Abstract: An optical ring network architecture including a number (N) of multi-add/drop filters, such as filters formed using symmetrical pairs of frequency routers. Each multi-add/drop filter is coupled to two other multi-add/drop filters. using N?2 transmission media, such as optical fibers, to form a ring. The network also includes a number (N) of terminal stations associated with the multi-add/drop filters. A terminal station (p) is coupled with, and receives information from, its associated multi-add/drop filter (p) through a single optical fiber. In addition, the terminal station p is coupled with, and transmits information in a first direction around the ring to, a multi-add/drop filter p+1 through a single optical fiber. Communications from terminal station p to each other terminal station in the first direction are assigned one of N?1 wavelengths such that no two wavelengths on a given optical fiber are associated with communications between terminal stations in the same direction.

Abstract: A simple optical waveband multiplexer/demultiplexer operable to separate a wavelength-division multiplexed light beam WDM consisting of a plurality of wavebands WB each including a plurality of optical channels, into a predetermined plurality of wavebands WB, and output the separated plurality of wavebands WB from a plurality of output ports, wherein the wavelength-division multiplexed light beam WDM is transmitted through two array waveguides each capable of performing a demultiplexing function with a resolution corresponding to wavelengths of the optical channels, and a characteristic of sequentially shifting the output ports by one position with shifting of input ports by one position, whereby the wavelength-division multiplexed light beam WDM is separated into a plurality of wavebands WB each including the mutually different optical channels selected from the optical channels included in the wavelength-division multiplexed light beam WDM, and the separated wavebands WB are outputted from the plurality of

Abstract: Where add optical signals have k different bit rates, an add controller is connected to k (<N) of N input ports and sends the add optical signals to the k input ports to perform add control. A drop controller is connected to m (<M) of M output ports and performs drop control on optical signals from the m output ports. The k input ports of an N×M wavelength selective switch and the add controller are connected by k links (L1 to Lk) which have introduced therein dispersion compensators for compensating chromatic dispersions of the add optical signals with the respective bit rates. The add controller selects a link through which an add optical signal is to be passed for dispersion compensation, and sends the signal to the N×M wavelength selective switch via the selected link.

Abstract: A wavelength selective switch utilizing aperture-shared optics and functionally distinct planes of operation that enables high fiber port counts, such as 1×41, and multiplicative expansion, such as to 1×83 or 1×145, by utilizing elements optimized for performance in one of the functionally distinct planes of operation without affecting the other plane.

Abstract: Apparatus and methods for using a tunable optical source in safety curtain applications provide for enhanced operation of the safety curtain. In an embodiment, a safety curtain includes a transmit unit and a receive unit to operate as the safety curtain, where a single tunable light source generates different wavelengths of light and a single detector is used to detect the generated light.

Abstract: Embodiments of the present invention are directed to multiplexer/demultiplexer systems. In one aspect, a multiplexer/demultiplexer system includes an input/output waveguide, two or more output/input waveguides, and a planar, non-periodic, sub-wavelength grating. The grating is configured so that when the system is operated as a multiplexer, each wavelength of light output from one of the two or more output/input waveguides is reflected by the grating toward the input/output waveguide. When the system is operated as a demultiplexer, each wavelength of light output from the input/output waveguide is reflected toward one of the two or more output/input waveguides.

Abstract: An optical add drop multiplexer (OADM) for use in a sensing system has the OADMs arranged either in a cascade or in a ring, with each OADM accepting a source input and generating a source output, and accepting a signal input and generating a signal output, where the source input includes a broadband optical source for use in providing optical power to a plurality of sensor gratings arranged in a series string, each sensor grating responsive to a physical parameter at a unique wavelength. The series string of sensors is excited by optical power coupled from the broadband source port, and returns optical signal response to a sensor port of the OADM, which optical energy is added to optical energy at the signal input port to form the signal output port. In another embodiment for a ring topology, the source ports and signal ports include a clockwise and counterclockwise set of source and sensor signals, and the sensor signals for CW and CCW each include a primary and secondary signal.

Abstract: A hermetically packaged, MEMS array-based ROADM module is disclosed. The enclosure sidewalls and a top lid are made of Kovar, and the base is made of alumina ceramic AuSn-soldered to the enclosure sidewalls. The MEMS array is attached to the ceramic base. The optics are passively pre-aligned using a removable template and epoxied to an optical bench. The optical bench is actively aligned as a whole and attached to the ceramic base. A plurality of electrical feedthrough contact pins extend from the bottom of the ceramic base for connecting the MEMS to a connector on a printed circuit board. In one embodiment of the invention, the ceramic base extends beyond the footprint of the sidewalls of the enclosure of the module, for mounting additional electronic components, for example MEMS driver circuitry chips, directly to the ceramic base of the enclosure.

Abstract: A reconfigurable optical add-drop multiplexer (ROADM) and a method of passing at least one optical channel through the multiplexer. In one embodiment, the multiplexer includes: (1) a main input port, (2) a main output port, (3) an add input port, (4) a drop output port, (5) dispersive optics configured spatially to spread and recombine optical spectra containing optical channels and (6) a spatial light modulator having an integral, lateral-gradient volume Bragg grating and configured to assume a bar state in which at least one of the optical channels is passed from the main input port to the main output port and at least another of the optical channels is passed from the add input port to the drop output port and a cross state in which the integral, lateral-gradient volume Bragg grating is transmissive with respect to the channels.

Abstract: A light is incident on a refractive diffraction grating 13, and is distributed for each of wavelengths at different angles to be outputted. A lens 14 converts the distributed lights into belt-shaped lights, and the belt-shaped lights are incident on a mirror substrate 15 having selective reflection regions 17-1 to 17-x. By moving the mirror substrate 15 toward a direction different from a distribution direction of the belt-shaped lights, only the light of any one of wavelengths is reflected. Then, the light returning to the refractive diffraction grating 13 is reflected to an incident direction of the original light. Accordingly, a tunable filter which is able to select a light of an arbitrary wavelength by moving the mirror substrate 15 can be realized.

Abstract: A tunable filter is provided.

Abstract: Methods and structures are disclosed demultiplexing optical signals transmitted over an optical fiber into a silicon substrate and to multiple detectors. The silicon substrate has two spaced-apart surfaces and a diffractive element disposed adjacent to one of the surfaces. Each of the optical signals corresponds to one of multiple wavelengths. The optical signals are directed into the silicon substrate along a path through the first surface to be incident on the diffractive element. The path is oriented generally normal with the first surface and/or with the diffractive element, which angularly separates the optical signals such that each of the wavelengths traverses through the substrate in a wavelength dependent direction to the first surface. Each optical signal is steered from the first surface towards the second surface to be incident on different optical elements that direct them generally normal to the first surface to be incident on one of the detectors.

Abstract: An inventive controllable optical multiplexer for control of multiplexing channels in a fiber-optic communication system provided with 2N of wavelength-division multiplexing channels, whose optical frequencies are re-tunable at a constant wavelength shifting between adjacent channels, comprises a multi-stage structure of optical filters provided with elements for controllable re-tuning transmission coefficients. The optical filters are embodied in the form of single stage, and multi-stage asymmetric Mach-Zehnder interferometers. The electro-optical and thermo-optical phase shift devices are used for controllable re-tuning the transmission coefficients of the optical filters. The demultiplexer can be produced according to integrated optic technologies in the form of a monolithic solid-state device.

Abstract: A method is provided for routing optical signals in an optical transport network. The method includes: separating an incoming optical multiplexed signal having a plurality of wavelength-channels embodied therein into two or more channel groups, where each channel group has a subset of the wavelength-channels and channels to be routed hitlessly in a given channel group are adjacent to a channel free region; providing a wavelength selective element for each wavelength-channel to be routed hitlessly; and routing a given wavelength-channel by tuning the corresponding wavelength selective element to either the given wavelength-channel or a channel free region adjacent to the given wavelength-channel. Providing a channel free region next to each channel to be routed allows the use of inexpensive tunable elements, which typically cause hits as they tune, to effect hitless routing.

Abstract: The invention relates to a tunable optical add/drop module (TOADM) monolithically integrated on a single planar lightwave circuit (PLC). The present invention overcomes the shortcomings of the prior art by providing virtual pupils at the interface between the channel waveguides and the slab waveguide on the PLC for focusing each wavelength channel, and additional on-chip lenses on the PLC for transforming the focal plane of the spatially dispersive demultiplexer into a substantially flat plane at the edge of the PLC. On-chip lenses are realized as reflective surfaces within slab waveguiding regions having a surface curvature to provide optical power.

Abstract: An alternative design is given for an optimized quantum cryptographic entangling probe for attacking the BB84 protocol of quantum key distribution. The initial state of the probe has a simpler analytical dependence on the set error rate to be induced by the probe than in the earlier design. The new device yields maximum information to the probe for a full range of induced error rates. As in the earlier design, the probe contains a single CNOT gate which produces the optimum entanglement between the BB84 signal states and the correlated probe states.

Abstract: The present invention is a wavelength superimposing device that can restrain a system scale and further reduce an optical transmission loss, while broadcasting a video signal light in a WDM network system, a manufacturing method therefor, and the WDM network system, and comprises a filter device that reflects some light of an input wavelength-multiplexed light in a direction different from an optical path direction of the input wavelength-multiplexed light and transmits a light of remaining wavelengths, a first optical system in which a reflected light reflected by the filter device is re-incident on a plurality of incident positions on a reflecting surface of the filter device, and a second optical system in which a transmitted light from the filter device is spectrally separated for each wavelength and each separated light is incident on the plurality of incident positions from a transmission surface of the filter device.

Abstract: The present invention generally concerns the use of Bragg optical fibers in chirped pulse amplification systems for the production of high-pulse-energy ultrashort optical pulses. A gas-core Bragg optical fiber waveguide can be advantageously used in such systems to stretch the duration of pulses so that they can be amplified, and/or Bragg fibers can be used to compress optical signals into much shorter duration pulses after they have been amplified. Bragg fibers can also function as near-zero-dispersion delay lines in amplifier sections.

Abstract: An optical time delay apparatus comprises: a multi-wavelength optical source; a diffractive element set imparting a wavelength-dependent delay on signals routed from the source to a 1×N optical switch; and N diffractive element sets routing signals from the 1×N switch to an output port. The optical propagation delay between the source and the output port varies according to the operational state of the source and the 1×N switch. A photodetector may receive the time-delayed signal at the output port.

Abstract: A reconfigurable add-drop multiplexer (R-OADM) comprises an array of channel waveguides coupling two groups of diffractive element sets on a slab waveguide. The channel waveguides include switchable reflectors or are coupled to other channel waveguides by optical switches. Switching a reflector to reflect or setting a switch to couple two waveguides results in a corresponding wavelength channel being added or dropped. Switching the reflector to transmit or setting the switch to uncouple the two waveguides allows the corresponding wavelength channel to pass through the R-OADM without being added or dropped.