Abstract: A method for calibrating an optical transceiver. The method can include configuring optical switches to enable routing at least one output signal of modulator circuitry operably coupled to a first receive path of a coherent optical transceiver. The method can include configuring the input to at least one modulator to generate at least one first stimulus signal. The method can include configuring a path from the first receiver analog-to-digital converter to an adaptive algorithm circuitry. The method can include adapting at least one bias setting of a photodiode associated with the first receiver in response to at least one first stimulus detected at the first receiver analog-to-digital converter to an adaptive algorithm circuitry. The method can include determining an optimum value of a photodiode associated with the first receiver.

Abstract: A clock data recovery (CDR) apparatus can include an interpolator circuitry to interpolate an input received signal and to generate an output signal removing the sampling clock offsets. The apparatus can include timing error detector (TED) circuitry coupled to process the output signal and to provide a timing error as feedback to the interpolator circuitry, the timing error being adjusted by gain factors used in at least one of an automatic gain control (AGC) circuitry and an orthogonalization circuitry. The apparatus can include loop filter (LF) circuitry to filter the timing error to remove noise effects. The apparatus can include numerically controlled oscillator (NCO) circuitry to adjust for a basepoint and fractional interval used to adjust resampling coefficients within the interpolator circuitry.

Abstract: An apparatus can include transceiver circuitry to receive an input signal from a target apparatus. The apparatus can further include a processing circuitry to determine position information of a source object and a target object. Based on the position information, the processing circuitry can calculate a relative velocity and determine a Doppler shift or carrier frequency offset in the input signal based on the relative velocity. The processing circuitry can adjust a local oscillator frequency based on a Doppler measured using the position information in an initial link acquisition phase. The processing circuitry can track the Doppler continuously over a range of tens of gigahertz accounting for Doppler phase ambiguities, and correct for a tracked Doppler shift by partially adjusting a local oscillator frequency and by correcting a residual Doppler shift digitally.

Abstract: An apparatus can include at least two circuit portions having separate power sequencer circuitry. The apparatus can further include processing circuitry configured to control at least one portion of the at least two circuit portions to operate at an initial low power level and subsequent higher power levels to full operation.

Abstract: A converter can include a number of time-to-voltage converters (TVCs) each receiving an input time-domain signal. The input time-domain signal can represent a different sample than input time-domain signals of the other TVCs. The converter can also include a capacitive element coupled to outputs of the TVCs to receive a combined output signal of the TVCs. The capacitive element can provide an input capacitance of an analog-to-digital converter (ADC). Other methods and apparatuses are described.

Abstract: An annular fluid-filled sample chamber is used to provide observation of unbounded motion of objects in the fluid. Rotation of the sample chamber is under automatic control to compensate for azimuthal motion of the object, thereby keeping the object in a fixed field of view of an optical observation system. Further motion control can be provided in the radial and focus directions, which can be used to provide full 3D tracking of objects as they move in the fluid. An important application of this work is to observation and tracking of objects that move up or down in the fluid with respect to gravity.

Abstract: An annular fluid-filled sample chamber is used to provide observation of unbounded motion of objects in the fluid. Rotation of the sample chamber is under automatic control to compensate for azimuthal motion of the object, thereby keeping the object in a fixed field of view of an optical observation system. Further motion control can be provided in the radial and focus directions, which can be used to provide full 3D tracking of objects as they move in the fluid. An important application of this work is to observation and tracking of objects that move up or down in the fluid with respect to gravity.