Abstract: An optical modulator device and method, including and utilizing: a first optical waveguide arm including one or more optical phase shifters, e.g., pn junctions, and configured to receive a first bias voltage Vbias1; and a second optical waveguide arm including one or more optical phase shifters, e.g., pn junctions, and configured to receive a second bias voltage Vbias2; wherein the first bias voltage Vbias1 and the second bias voltage Vbias2 are dissimilar, such that the first optical waveguide arm and the second optical waveguide arm exhibit a same phase modulation. Vbias1 and Vbias2 are selected such that the corresponding slopes V? of the associated phase shift versus applied bias voltage curves are equal. The optical modulator device further includes a driver coupled to the first optical waveguide arm and the second optical waveguide arm and including a current offset control circuit operable for providing Vbias1 and Vbias2.

Abstract: An amplifier circuit includes: an amplifier configured to receive at least one input signal and generate an output voltage in response to the at least one input signal and a gain control voltage; a voltage detector configured to generate a detector voltage based on the output voltage; a gain control summation circuit configured to generate an error signal by subtracting the detector voltage from a reference voltage; a loop filter configured to generate the gain control voltage based on the error signal and adjust the loop bandwidth in response to a loop filter adjust signal; and an analog automatic gain control bandwidth controller configured to monitor the detector voltage and the gain control voltage, to provide the reference voltage and the loop filter adjust signal, and to control a loop bandwidth of the output signal.

Abstract: A photodetector circuit is disclosed. The photodetector circuit includes an optical input configured to receive a source optical signal for detection by the photodetector circuit, an optical waveguide for coupling the optical input and at least one side of a plurality of sides of a photodiode, wherein the optical waveguide is configured to generate a first optical signal and a second optical signal from the source optical signal, and the photodiode coupled to the first optical waveguide, where the photodiode is illuminated on the at least one side by the first and second optical signals at different locations on the photodiode, where the photodiode generates a photocurrent based on the first and second optical signals reducing photocurrent saturation. Providing a delay between the first and second optical signals reduces an out-of-band frequency response of the photodiode circuit.

Abstract: A flip-chip manufacture is described. Methods of blocking adhesive underfill in flip-chip high speed component manufacture include creating topology discontinuities to prevent adhesive underfill material from interacting with RF sensitive regions on substrates.

Abstract: The invention relates to a method of improving the performance of optical receivers within optical transceivers by compensating for crosstalk, both optical and electrical. Optical crosstalk may arise within the optical receiver from a variety of sources including directly from the optical emitter within, indirectly from the optical emitter via losses, and losses of other received wavelengths within the optical transceiver coupled to the optical receiver. Electrical crosstalk may arise for example between the electrical transmission lines of the optical transmitter and optical receiver. The method comprises providing a secondary optical receiver in predetermined location to the primary optical receiver, the optical receivers being electrically coupled such that the crosstalk induced photocurrent in the secondary optical receiver is subtracted from the photocurrent within the primary optical receiver. The method may be applicable to either monolithic and hybrid optical transceivers.