Abstract: The invention relates to a system (1) for generating a (high-frequency) beat signal. The system has a first light source (3) with a multimode spectrum, a second light source (4) and a coupler and filter arrangement (5) with a first port (6) for coupling in light from the first light source (3), and a second port (7) for coupling in light from the second light source (4). Furthermore, a detector (11) is provided to which light of both light sources (3, 4) can be supplied. The coupler and filter arrangement (5) has a spectral filter (20, 28) for filtering out one or several modes from the spectrum of the first light source (3), and a first fiber-optical coupler (17, 23, 26) for coupling the light of the second light source (4) and the not yet filtered or the already filtered light of the first light source (3). The coupler and filter arrangement (5) is configured to be merely fiber-optical.

Abstract: A Periodic Cluster State Generator (PCSG) consisting of a monolithic integrated waveguide device that employs four wave mixing, an array of probabilistic Photon Guns, single mode Sequential Entanglers and an array of controllable entangling gates between modes to create arbitrary size and shape cluster states with several constraints. The cluster state is assumed linear or square lattice. Only nearest neighbor qubits are entangled. Such a cluster state resource has been proven to be able to perform universal quantum computing if the initial state is large enough.

Abstract: A reflective element for directing an optical signal into a fiber optic sensor having an optical fiber includes a plane containing a sharply defined straight line that separates between a first area of low reflectivity and a second area of high reflectivity. The plane is disposed parallel to a free end surface of the optical fiber so that the free end surface intersects the line of the reflective element, whereby relative movement between the free end surface of the optical fiber and the line in response to a physical change sensed by the fiber optic sensor induces variations in an optical signal reflected by the reflective element through the optical fiber, which variations allow measurement of the physical change.

Abstract: An optoelectronic chip including a coupler region, and a method of manufacturing the same, include a substrate; a coupler region formed of a material having a refractive index lower than the substrate and surrounded by the substrate. The coupler region includes a total reflection surface that totally reflects light incident through a surface of the substrate into the substrate or emits light guided in the substrate through the surface of the substrate.

Abstract: A method of fabricating silicon waveguides with embedded active circuitry from silicon-on-insulator wafers utilizes photolithographic microfabrication techniques to define waveguide structures and embedded circuit recesses for receiving integrated circuitry. The method utilizes a double masking layer, one layer of which at least partially defines at least one waveguide and the other layer of which at least partially defines the at least one waveguide and at least one embedded circuit recess. The photolithographic microfabrication techniques are sufficiently precise for the required small structural features of high frequency waveguides and the double masking layer allows the method to be completed more efficiently. The basic fabrication method may be extended to provide batch arrays to mass produce silicon waveguide devices.

Abstract: A method for fabricating a coaxial structure having an electrical conductor surrounded by an optically conductive dielectric is disclosed. The method may include creating an optical trench in an electrical conductor and depositing an optical material into the optical trench to cover an inner surface of the trench. The method may also include removing a portion of the deposited optical material from the optical trench to form an embedded trench in the deposited optical material, and building up electrically conductive material from within the embedded trench to create an inner electrical conductor. The method may also include depositing optical material around an exposed portion of the inner electrical conductor to create an optical channel encapsulating the inner electrical conductor, and depositing electrically conductive material over a top surface of the optical channel and over a top surface of the first electrical conductor to create the coaxial structure.

Abstract: An IR supercontinuum source for generating supercontinuum in the MIR or possibly LWIR spectral bands comprises a supercontinuum fiber formed from a heavy metal oxide host glass having low optical loss and high non-linearity over the spectral band that is stable, strong and chemically durable. The supercontinuum fiber is suitably a depressed inner clad fiber configured to support only single transverse spatial mode propagation of the pump signal and supercontinuum. The source suitably includes a tapered depressed inner clad fiber to couple the pump signal into the supercontinuum fiber. The source may be configured as an “all-fiber” source.

Abstract: An optical fiber link suitable for use in a mode division multiplexing (MDM) optical transmission system is disclosed. The link has a first optical fiber having a core which supports the propagation and transmission of an optical signal with X LP modes at a wavelength of 1550 nm, wherein X is an integer greater than 1 and less than or equal to 20, the first fiber having a positive differential mode group delay between the LP01 and LP11 modes at a wavelength between 1530-1570. The link also has a second optical fiber having a core which supports the propagation and transmission of an optical signal with Y LP modes at a wavelength of 1550 nm, wherein Y is an integer greater than 1 and less than or equal to 20, said optical fiber having a negative differential mode group delay between the LP01 and LP11 modes at a wavelength between 1530-1570.

Abstract: A monolithic integrated structure comprising a buried heterostructure semiconductor optical amplifier and a deep ridge optical receiver comprising such structure are disclosed.

Abstract: Described embodiments include optical connections for electronic-photonic devices, such as optical waveguides and photonic detectors for receiving optical waves from the optical waveguides and directing the optical waves to a common point. Methods of fabricating such connections are also described.

Abstract: An optical lens connector includes alignment features for passive connection alignment. The alignment features have generally planar surfaces to interface with a mating connector. The alignment features passively align an optical fiber with an optical lens in the optical lens connector, by fitting adjacent to planar surfaces of the mating connector. When interfaced together, the alignment features restrict lateral and vertical motion of the connectors with respect to each other, which helps keep the optical lens aligned with the optical fiber.

Abstract: The subject matter disclosed herein relates to an optical device comprising: a light guide film to transport light rays via total internal reflection; a first optical layer covering at least a portion of a first side of the light guide film, the first optical layer to receive an exiting portion of the light rays; a second optical layer covering at least a portion of the first optical layer; and a grating pattern located at an interface between the first optical layer and the second optical layer to out-couple light rays travelling in the light guide film, wherein the grating pattern is configured so that the exiting portion of the light rays transmit through the grating pattern twice before being total internally reflected by the grating pattern.

Abstract: An optical component has first and second planar lightwave circuits. The first and second planar lightwave circuits are aligned and jointed such that the position of an i-th optical waveguide (where i is an integer greater than or equal to 1 and less than or equal to n) of the first planar lightwave circuit and that of an i-th optical waveguide of the second planar lightwave circuit are matched on a joint interface. An angle formed by the i-th optical waveguide of the first planar lightwave circuit and a normal of the interface is configured to vary in accordance with a value of i within a range satisfying the Snell's law.

Abstract: Cables are constructed with discontinuities in the cable jacket that allow the jacket to be torn to provide access to the cable core. The discontinuities can be longitudinally extending strips of material in the cable jacket. The discontinuities allow a section of the cable jacket to be pulled away from a remainder of the jacket using a relatively low peel force.

Abstract: This invention relates to a fiber reinforced plastic material with improved flexibility and high tensile strength for use in optic cables. The strength member composition comprises a polypropylene based thermoplastic resin, a continuous fiber having a modulus greater than 80 PGa, and talc.

Abstract: An insulation pressure-resistant cylinder body of submarine (undersea) cable equipment, submarine cable equipment, and a manufacturing method are provided. The insulation pressure-resistant cylinder body includes: an installation cylinder, an insulation layer, and a pressure-resistant cylinder, disposed sequentially from inside to outside, where a first groove is opened on an outer surface of the installation cylinder, and a second groove is opened on an inner surface of the pressure-resistant cylinder, the second groove is interlaced with the first groove, and the insulation layer is closely adhered to the outer surface of the installation cylinder and the inner surface of the pressure-resistant cylinder.

Abstract: A fiber optic management unit for handling optical fibers unit having a base with first and second segments miming perpendicular to each other. A tray is pivotably attached to the second segment such that the tray is transferable between a first position in which the fiber routing track of the first segment is closed and a second position in which the fiber routing track of the first segment is opened when the tray is pivoted around a first axis, and wherein the tray is transferable between the second position in which the fiber routing track of the first segment is opened and a third position in which the fiber routing track of the first segment is also opened when the tray is pivoted around a second axis running perpendicular to the first axis.

Abstract: An optical apparatus comprises: a waveguide substrate, optical cladding formed on the substrate; a waveguide core formed within the cladding, an optically absorptive layer formed within the cladding, and a linearly polarized light source. The waveguide core includes an attenuating segment thereof, and the absorptive layer is formed near the attenuating segment of the core. The core and cladding are arranged to form an optical waveguide that supports a propagating optical mode. The absorptive layer is positioned near the attenuating segment of the core so as to spatially overlap a portion of the optical mode. The extent of the overlap results in a designed level of optical loss per unit distance of propagation of a linearly polarized optical signal along the attenuating segment of the optical core in the optical mode without substantial alteration of the polarization state of the optical signal.

Abstract: A light guide has a transmission of greater than 90 percent, a refractive index greater than 1.4, and less than 10 haze percent. The light guide also includes an organosiloxane block copolymer having a weight average molecular weight of at least 20,000 g/mole. The organosiloxane block copolymer includes 40 to 90 mole percent disiloxy units of the formula [R12SiO2/2] arranged in linear blocks each having an average of from 10 to 400 disiloxy units [R12SiO2/2] per linear block, 10 to 60 mole percent trisiloxy units of the formula [R2SiO3/2] arranged in non-linear blocks each having a weight average molecular weight of at least 500 g/mol, and 0.5 to 25 mole percent silanol groups [?SiOH]. R1 is independently a C1 to C30 hydrocarbyl and R2 is independently a C1 to C20 hydrocarbyl. Moreover, at least 30% of the non-linear blocks are crosslinked with another non-linear block and aggregated in nano-domains.

Abstract: In embodiments, the present invention provides a method and system for managing playback of content delivered to a mobile device with a pause and resume functionality. The method and system including receiving delivered content on a mobile device, initiating playback of the delivered content, pausing playback of the content being delivered to the mobile device in response to an action and resuming delivery of the content upon a request.

Abstract: To improve user-friendliness in recording AV data created after recording is started until it is stopped as a file. AV data that are created after recording is started until it is stopped are recorded as a file. Information that represents a reproduction region and mark information that represents a jump position are additionally written to a reproduction list file. At this point, it is determined whether or not restrictions that have been set to the reproduction list file and an attribute file for additional writing are satisfied on the basis of the reproduction list file as an additionally writable candidate and the attribute file that correlates reproduction time and address of the AV data. When having been determined that they be satisfied, the reproduction region information and the mark information are additionally written to the reproduction list file as the additionally writable candidate. When having been determined that they be not satisfied, a new reproduction list file is created.

Abstract: Embodiments of the invention include a method that comprises receiving a request to record television content on a specified channel for a specified period of time. The method can also include tuning to the specified channel at the specified time, and recording the specified content. The method can also include determining that one or more segments of the television content is corrupted. The method can also include presenting a notification indicating that some of the television content is corrupted, retuning to the specified channel made by the request, and acquiring uncorrupted television content for use in replacing the one or more segments of corrupted television content.

Abstract: It is provided a recorder apparatus in which a user can use simply and efficiently plural functions which can be performed simultaneously. According to an embodiment of the invention, a recorder apparatus has a display, an input section for a video being inputted, a random access recording medium for recording the video, an output section for outputting the video recorded in the recording medium, a multitask control section, a display control section and a reception section for receiving an specification of the tab and the direction of the video for a processing target for the selected function. The multitask control section performs plural functions in parallel simultaneously which plural functions includes a function for recording the inputted video in the recording medium. The display control section displays tabs assigned to the plural functions respectively and processing situation of the function selected by specifying the tab on the display.

Abstract: In a recording medium on which is recorded a multiplexed stream including a plurality of first packets (V_main) constituting a first I-picture in a first video stream and a plurality of second packets (V_sub) constituting a second I-picture in a second video stream, information for identifying the first I-picture and information for identifying the second I-picture are recorded on the medium. A recording medium can thereby be obtained that enables the rapid detection, from a small amount of information, of a particular picture included in a stream such as a TS in which multiple content streams are multiplexed.

Abstract: Identification of starting and ending times of commercial breaks and commercials within those commercial breaks found in audiovisual content is disclosed. A solution to a “batch optimization” problem is used in which commercial locations within a set of audiovisual content are detected as a group by choosing a set of commercial locations which optimizes a cost function which can include considerations of, for example, 1) one or more cues, 2) relative locations of commercials within the audiovisual content, and/or 3) probability models based on statistics obtained regarding characteristics of typical commercial and commercial breaks. Optimization can be done over the total set of commercial location decisions, rather than on a per-commercial basis. Additionally, the cost function can be iteratively evaluated and many more types of cues and combinations of cues can be used in detection of commercials.

Abstract: A device is provided for use with a digital content provider and a content purchaser. The content provider can provide digital content and a first digital key, wherein the digital content has quantified digital rights associated therewith. The device includes a receiving portion, a security portion, a content database, an interface portion and a transmitting portion. The receiving portion can receive the digital content and the first digital key. The security portion can access the digital content with the first digital key. The content database can store the digital content. The interface portion can offer to the content purchaser the digital content and can enable the content purchaser to purchase the digital content in accordance with purchased quantified digital rights. The security portion can further encrypt the digital content with a digital key such that the content purchaser may use the purchased digital content.

Abstract: A media content item is evaluated for its “sentiment states.” That is, segments of the content item are determined to be, for example, “happy,” “exciting,” “sad,” “funny,” and the like. A “sentiment map” is created that delimits segments of the content item and contains the sentiment-state keywords associated with the segments. Some maps include an amplitude for each assigned sentiment keyword and a confidence value for the segment delimitation and for each keyword. As an exemplary use of the sentiment map, an advertisement broker matches the sentiments of his advertisement offerings with segments of a content item in order to place appropriate advertisements at times when they would be most favorably received. In another example, a recommender system recommends to a user a content item whose sentiment map compares favorably to that of a content item already enjoyed by the user.

Abstract: A method for editing content, including receiving content from content storage, calculating a score for each frame of the content based on weighted parameter scores, grouping frames into frame groups, calculating a group score for each frame group based on the scores of the frames within the frame group; selecting frame groups having a group score beyond a score threshold, comparing a total length of the selected frame groups to a target length with the system, adjusting the score threshold until the total length of the selected frame groups substantially matches the target length with the system, combining the selected frame groups into a video with the system, and sending the video to a device with the system.

Abstract: An apparatus for recording multimedia content transmitted over a network including a reception interface for receiving the multimedia content from the network, a user input interface for receiving user inputs, and a storage resource including executable instructions including a recording module for recording the multimedia content in accordance with the user inputs. The user inputs also include a multimedia selection signal for indicating the multimedia content to be recorded, and a segmenting signal for indicating a size of at least one of a plurality of segments in which the multimedia content is recorded.

Abstract: Access point pictures designated as randomly accessible positions are I pictures or P pictures. Information indicating the decoding sequence (I1, P1, B1, B2, B3, B4, P2, . . . ) of pictures functioning as access points and attribute information (picture_type) indicating whether a picture functions as an access point or is necessary for decoding of the access point following a given access point are recorded on the video information recording medium. Random access is possible even if the GOP interval is lengthened.

Abstract: An image capturing apparatus comprises: a lens unit capable of changing a focal length; an imaging unit that outputs an image signal according to light incident through the lens unit; a filter capable of moving in a direction of insertion to an optical path of the imaging unit and in a direction of retraction from the optical path; and a control unit that controls a position of the filter using information related to the focal length of the lens unit.

Abstract: System and method embodiments are provided herein to obtain minimum or optimal spare capacity allocation (SCA) using partial disjoint paths (PDP) for bi-connected network topology. Both an integer linear programming (ILP) optimization model and an approximation algorithm, referred to herein as Successive Survivable Routing (SSR), are formulated for resolving the SCA with PDP. The embodiments include assigning a working path and a primary backup path on two disjoint routes between two end nodes, and assigning a plurality of secondary backup paths that are partially disjoint and that each pass through one fiber cut group on one of the two disjoint routes and all remaining fiber cut groups on the other one of the two disjoint routes. Each of the fiber cut groups includes all fiber cut pairs on both disjoint routes that have the same effect of interrupting a flow on both disjoint routes.

Abstract: An optical transmission device includes an extractor that extracts respective optical signals from optical signals multiplexed from a plurality of optical signals of different wavelengths, a detector that detects wavelengths of the extracted respective optical signals, a storage that stores the wavelengths of the detected respective optical signals, and a processor that is operative to derive trends in wavelength variation of the respective optical signals based on the detected respective optical signals and the respective optical signals stored in the storage, and determines that either one or both of the extractor and the detector cause the wavelengths to be varied when the trends in wavelength variation of two or more wavelengths are the same.

Abstract: In one embodiment, a local network device collects local optical power information for at least one of either a local optical transmit interface and a local optical receive interface of the local network device. The local network device may then exchange the local information for remote optical power information of corresponding remote optical receive and transmit interfaces of a remote network device at an opposing end of at least one corresponding optical link (fiber). For example, an exchange may use a point-to-point protocol which may dynamically determine/discover neighboring relationships between capable peer device interfaces and establish a suitable communication exchange between the capable peers. Based on the local information and exchanged remote information, the local network device may calculate an optical power loss of each corresponding optical link.

Abstract: An ONU includes a power-interruption detecting unit configured to detect power interruption of the ONU, a transmitting and receiving unit capable of being set in a power saving state, and a PON-side control unit configured to notify an OLT of, as power saving return information, a power holding time during occurrence of the power interruption of the ONU and a startup time, which is time until the transmitting and receiving unit returns from the power saving state, and, when the power-interruption detecting unit detects the power interruption, transmit a power interruption notification to the OLT. The OLT includes the PON control unit configured to determine, based on the power saving return information, whether the ONU can transmit the power interruption notification when the power interruption occurs in the power saving state.

Abstract: A method for processing optical signals includes performing frequency mixing, photoelectric detection, analog/digital conversion, and dispersion compensation on received input optical signals. First-path polarization multiplexing optical signals and second-path polarization multiplexing optical signals. An initialization update process is performed on filter coefficients. Polarization compensation is performed on the first-path polarization multiplexing optical signals and the second-path polarization multiplexing optical signals by using the filter coefficients on which the initialization update is performed to obtain initialized x-path optical signals and initialized y-path optical signals. Preset x-path training sequences and y-path training sequences are synchronized by using the initialized x-path optical signals and the initialized y-path optical signals. If a synchronization result indicates that polarization cross occurs, the polarization cross is rectified.

Abstract: The present principles are directed to a transponder aggregator-based optical loopback in a multi-degree colorless, directionless, contention-less, reconfigurable optical add/drop multiplexer. The multiplexer includes a reconfigurable optical add/drop multiplexer section for performing connect operations for wavelength division multiplexing signals among all degrees. The section has a plurality of subsections. Each of the subsections corresponds to a respective one of the degrees and has an optical separator at an input side and an optical combiner at an output side. The multiplexer further includes a transponder aggregator section having a split-and-select switch-based transponder aggregator. The multiplexer also includes an optical line loopback having a connection path between the optical separator at the input side and the optical combiner at the output side of at least one of the subsections.

Abstract: In an automatically switched optical network operating according to a wavelength plan, the wavelengths are assigned to an optical path based on availability, performance and SRS wavelength coupling reduction. First, the wavelengths are grouped in static bins based on their reach versus cost performance, and each bin assumes a ?Q of a middle wavelength. Then, the bins are moved into subsets of dynamic bins, constructed using bin constraints that account for the particulars of the respective optical path. The path is characterized taking into account the wavelength currently accessing at the end nodes, and the wavelength tandeming through the end nodes. Wavelength selection starts with the bins that satisfy the maximum number of constraints, and the wavelengths are checked sequentially against wavelength constraints; relaxed constraints are also applied when it is not possible to exactly satisfy one or more constraints.

Abstract: An apparatus, e.g. an optical receiver, includes an optical front end and an equalizer. The front end is configured for receiving an optical signal bearing first and second symbols on respective first and second polarization channels. The equalizer is configured to 1) select a first cost function if the first symbol has greater energy than the second symbol, 2) select a second different cost function if the second symbol has a greater energy than the first symbol, and 3) based on the selected cost function, update coefficients of an adaptive filter configured to demultiplex and equalize the first and second polarization channels.

Abstract: The embodiments provide an inverse channel apparatus and transmitter, receiver and system containing the apparatus; wherein the inverse channel apparatus comprises: an inverse nonlinear calculating unit configured to perform nonlinear additive calculation and nonlinear multiplicative calculation on input signals, so as to obtain signals containing nonlinear damage of the input signals on at least one polarization state; and an inverse linear calculating unit configured to calculate signals containing nonlinear damage and linear damage of the input signals on at least one polarization state according to the signals containing nonlinear damage of the input signals on at least one polarization state and a linear function of a channel.

Abstract: A wavelength division multiplexing passive optical network (WPON) comprising an optical line terminal (OLT) and a plurality of optical network units (ONUs) coupled to the OLT via a power optical splitter. The OLT is configured to monitor wavelengths in use by the ONUs and to divide upstream traffic from the ONUs into multiple channels using tunable filters. Also disclosed is an OLT for a PON, the OLT comprising a plurality of receivers and a plurality of tunable filters corresponding to each of the receivers. The OLT also comprises channel control logic coupled to the tunable filters, wherein the channel control logic is configured to detect a plurality of wavelengths in use for upstream traffic in the PON and to divide the upstream traffic into multiple channels using the tunable filters. Included is a method for managing upstream traffic in a PON, the method comprising monitoring, by a processor, wavelengths in use for upstream traffic in the PON.

Abstract: An ONU includes a CDR that regenerates a clock based on a signal from an OLT, an oscillator that generates an internal clock, a time stamp counter that manages a time of the ONU based on the clock in a period in which the CDR regenerates the clock and manages the time of the ONU based on the internal clock in a period in which the CDR does not regenerate the clock, an MPCP control unit that decides, when a Cyclic Sleep mode is set, a receiver-time synchronization time that is a period in which the receiver is normally operated within a sleep time, based on a difference between a time stamp value included in the signal transmitted from the OLT and a time stamp managed by the time stamp counter, and a power-saving control unit that controls the receiver to be normally operated in the receiver-time synchronization time.

Abstract: A waveguide assembly for a use with, for example, a microwave receiver. The waveguide assembly includes: a waveguide; a tapered structure disposed within the waveguide, the tapered structure tapering in thickness from a first end with a zero height to a second end where the tapered structure has a height which nearly fills, but does not completely fill, the waveguide, to thereby define a modulator receiving space between the tapered structure and an adjacent wall of said waveguide. The second end of the tapered structure is preferably disposed adjacent an open circuited end of the waveguide. An electro-optic modulator is disposed on a dielectric substrate, the dielectric substrate being disposed at least partially within the modulator receiving space and the electro-optic modulator being disposed so that it is located, in use, at an antinode of a standing wave of the waveguide assembly.

Abstract: A gearbox IC is incorporated into an optical communications system to enable an optical link that incorporates the system to achieve data rates that are at least double that which are currently achievable in optical links. The gearbox IC performs data rate conversion and phase alignment. In the transmit direction, the gearbox IC receives N lanes of electrical data signals having a data rate of X Gbps and outputs N/2 lanes of electrical data signals having a data rate of 2X Gbps. In the receive direction, the gearbox IC receives N/2 electrical data signals having a data rate of 2X Gbps and converts the N/2 electrical data signals into N electrical data signals having a data rate of X.

Abstract: An apparatus and a method for providing synchronized data by using visible light communication includes, receiving a synchronization channel from a mobile communication base station using a specific mobile communication network, by a Light Emitting Diode (LED) lighting; analyzing the received synchronization channel, and extracting a synchronization signal for synchronizing the LED lighting with at least one LED lighting adjacent to the LED lighting; selecting a specific time slot of the synchronization signal based on IDentifications (IDs) of the LED lightings; and including a data frame of the LED lighting in the specific time slot, and transmitting the specific time slot, which includes the data frame of the LED lighting, to a mobile terminal.

Abstract: A system and method in the field of free space optical communications (FSOC) for overcoming atmospheric-induced spatial optical signal variations operates within each of two FSOC terminals that make up a bi-directional FSOC link, with each terminal providing the rapid adaptive beam path method over a much wider field of view than typically used for adaptive optical techniques. Each terminal uses a real-time adaptive beam-steering technique that continuously measures optical power and optical power gradients by the receiver optical detectors; this data is sent to a control system that automatically responds by re-aligning the optical system accordingly by maximizing the optical signal power measured by the optical power receiving detector.

Abstract: A system and method is disclosed wherein optical signals are coded in a transmitter by tuning or modulating the interbeam delay time (which modulates the fourth-order coherence) between pairs of entangled photons. The photon pairs are either absorbed or not absorbed (transparent) by an atomic or molecular fluorescer in a receiver, depending on the inter-beam delay that is introduced in the entangled photon pairs. Upon the absorption, corresponding fluorescent optical emissions follow at a certain wavelength, which are then detected by a photon detector. The advantage of the disclosed system is that it eliminates a need of a coincidence counter to realize the entanglement-based secure optical communications because the absorber acts as a coincidence counter for entangled photon pairs.

Abstract: Disclosed is an optical signal transmitting apparatus including: an optical carrier generator configured to generate a plurality of optical carriers and outputs the optical carriers to optical modulators corresponding to the optical carriers, respectively; a plurality of optical modulators configured to modulate the optical carriers, respectively, according to an input signal; and an optical combiner configured to couple a plurality of optical signals from the plurality of optical modulators.

Abstract: An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted to the center of the data bands, and its polarization state is matched to the polarization state of the respective data bands to compensate for polarization mode dispersion during transmission. By shifting a boosted side carrier to the center of the data bands, and by simultaneously compensating for the effects of polarization mode dispersion, the provided system and method simulate the advantages of homodyne reception using a local oscillator. The deleterious effects of chromatic dispersion on the data signals within the data bands are also compensated for by applying a corrective function to the data signals which precisely counteracts the effects of chromatic dispersion.

Abstract: A multi-laser transmitter optical subassembly may include N number of lasers, where each laser is configured to generate an optical signal with a unique wavelength. The transmitter optical subassembly may further include a focusing lens and a filter assembly. The filter assembly may combine the optical signals into a combined signal that is received by the focusing lens. The filter assembly may include N?1 number of filters. Each of the filters may pass at least one of the optical signals and reflect at least one of the optical signals. The filters may be low pass filters, high pass filters, or a combination thereof.