Abstract: In part, in one aspect, the disclosure relates to a system including an integrated optical multiplexer. The integrated optical multiplexer may include a plurality of optical inputs configured and constructed to receive input optical signals; two or more stages of multiplexing in a cascading configuration, wherein the two or more stages of multiplexing are divided into wavelength stages and a last stage, wherein each of the wavelength stages combine subsets of input optical signals by wavelength, the last stage combines input optical signals by polarization using a polarization beam combiner, and at a combined output of the integrated optical multiplexer a first subset of the input optical signals have a different polarization than a second subset of the input optical signals.

Abstract: A method, system, and apparatus for multiplexing comprising feeding a signal into a sampler, splitting a first signal into an even branch at a first set of times, splitting a second signal into an odd branch at a second set of times, feeding a switch bleed current into the first branch at the second set of time and feeding the switch bleed current into the second branch at the first set of time.

Abstract: A system including an optical transceiver, including a first portion of a laser cavity operable to output optical energy; and an optical modulator operable to modulate the optical energy output by the laser; and a temperature-controlled optical gain subassembly optically coupled to the optical transceiver, the optical gain subassembly including a plurality of semiconductor optical amplifiers (SOAs), wherein one SOA of the plurality of SOAs is operable to amplify the optical energy inside a laser cavity.

Abstract: A method and apparatus for removing a daughter board from a mother board.

Abstract: A CMOS integrated circuit comprising digital-to-analogue converters (DACs), analogue-to-digital converters (ADCs), a digital signal processor (DSP), on-chip switching, an on-chip processor; and logic enabling to receive data from data sources in a 5G network, combine the data from the data sources into a single data stream, encode the single data stream using the DSP, and cause the encoded single data stream to be transmitted to another device in the 5G network.

Abstract: A photonic integrated circuit may be coupled to an optical fiber and packaged. The optical fiber may be supported by a fiber holder during a solder reflow process performed to mount the packaged photonic integrated circuit to a circuit board or other substrate. The optical fiber may be decoupled from the fiber holder, and the fiber holder removed, after completion of the solder reflow process.

Abstract: A method, system, and apparatus enabled to selectively choose a baud rate for communication of optical data using a modem enabled to operate with an optical signal modulated at plurality of finely tuned baud rates.

Abstract: Disclosed herein are methods, structures, apparatus and devices for the termination of unused waveguide ports in planar photonic integrated circuits with doped waveguides such that free-carrier absorption therein may advantageously absorb any undesired optical power resulting in a significant reduction of stray light and resulting reflections.

Abstract: A system and method of measuring a temperature including applying a first set of voltages across a circuit in sequence; detecting a second set of voltages corresponding to the first set of voltages, wherein the second set of voltages includes a first detected voltage, a second detected voltage, and a third detected voltage, wherein the first applied voltage corresponds to the first detected voltage, the second applied voltage corresponds to the second detected voltage, and a third applied voltage corresponds to the third detected voltage; modifying an output of a heater proximate to the diode within the circuit, wherein a combined heat dissipation of the heater and the diode remains constant during operation of the circuit; and determining a temperature proximate to the diode based on the first set of voltages and the second set of voltages.

Abstract: A method, apparatus, and system for an external cavity laser with a Michelson Interferometer.

Abstract: A system including an optical transceiver, including a first portion of a laser cavity operable to output optical energy; and an optical modulator operable to modulate the optical energy output by the laser; and a temperature-controlled optical gain subassembly optically coupled to the optical transceiver, the optical gain subassembly including a plurality of semiconductor optical amplifiers (SOAs), wherein one SOA of the plurality of SOAs is operable to amplify the optical energy inside a laser cavity.

Abstract: A method, system and apparatus for optimizing parameters between two optical coherent transceivers connected via an optical link, including determining performance of a second optical receiver; wherein the second optical transceiver uses a set of parameters; and inputting information into a side channel communication between a first optical transceiver and the second optical transceiver to update the set of parameters for the second transceiver.

Abstract: A current-balanced voltage source may include two regulated voltage sources, each having an input and an output, and an amplifier to receive a control voltage at a positive input and a feedback voltage at a negative input. The output of each amplifier is coupled to the input of the respective regulated voltage source. The outputs of the regulated voltage sources are coupled together to source a current to a load. A differential amplifier may include positive and negative differential inputs, and positive and negative differential outputs. The positive differential input is coupled to the output of the first regulated voltage source and the negative differential input is coupled to the output of the second regulated voltage source. The positive differential output provides the feedback to the first regulated voltage source, and the negative differential output provides the feedback to the second regulated voltage source.

Abstract: A method, system, and apparatus for parsing incoming frames; classifying the frames by information contained in a header of the ethernet frame; and performing an action on the classification.

Abstract: Aspects of the present disclosure provide an optical modulator with linearly distributed active circuitry coupled to a signal electrode to compensate for loss or attenuation of a high frequency modulation signal in the signal electrode. In one embodiment, negative resistance cells are attached to the signal electrode at various points, and have tunable negative resistances to compensate for the loss. In another embodiment, a segmented bias electrode is provided along the length of the optical waveguide in the optical modulator. Each segmented bias electrode may have a pre-determined bias voltage that can reduce impedance mismatches along the length of the signal electrode to reduce echoes and ripples in the modulation signal.

Abstract: A method system, and apparatus for adjusting skew in a circuit comprising feeding an input clock into a first push-pull source follower stage, feeding an inverse of an input clock bar into a first CMOS inverter stage, creating an output clock based on an equal contribution of the input clock of the first push-pull follower stage and the inverse of the input clock bar of the first CMOS invert stage, feeding the input clock bar into a first push-pull source follower stage, feeding an inverse of the input clock into a first CMOS inverter stage, and creating an output clock based on an equal contribution of the input clock bar of the first push-pull follower stage and the inverse of the input clock bar of the first CMOS invert stage.

Abstract: A method, system, and apparatus for emulating impairments in a communication system.

Abstract: In part, in one aspect, the disclosure relates to a system including a photonic integrated circuit (PIC) assembly, comprising a PIC comprising: a first bond pad disposed inward from an edge of the PIC a first distance; and a first wire having a first length, the first wire electrically connected to the first bond pad and extending therefrom, wherein the first distance is greater than 0.4 mm.

Abstract: Aspects of the present disclosure are directed to a photonic integrated circuit (PIC) having a resistivity-engineered substrate to suppress radio-frequency (RF) common-mode signals. In some embodiments, a semiconductor substrate is provided that comprises two portions having different levels of resistivity to provide both suppression of common mode signals, and reduction of RF absorption loss for non-common mode RF signals. In such embodiments, a bottom portion of the semiconductor substrate has a low resistivity to suppress common mode via RF absorption, while a top portion of the semiconductor substrate that is adjacent to conductors in the IC has a high resistivity to reduce RF loss.

Abstract: Disclosed herein are methods, structures, apparatus and devices for the termination of unused waveguide ports in planar photonic integrated circuits with doped waveguides such that free-carrier absorption therein may advantageously absorb any undesired optical power resulting in a significant reduction of stray light and resulting reflections.