An optical modulator generates an output signal using phase-shifted electrical carriers to create a virtual reference carrier.
A transmission device routes main signals through separate paths to enable delay measurement at the receiver.
A bias control mechanism adjusts the phase shifter to provide a 0+n*π radians phase difference between I-arm and Q-arm light waves.
A controller applies bias voltage based on detected DC component to stabilize optical modulator operation point.
Controllable phase inverters adjust distortion product orientation, resolving coefficient drift in directly-modulated laser systems.
Non-uniform signal levels compensate for square law detection to minimize bit error rates under Gaussian noise.
A multicarrier transmission apparatus generates independent in-phase and quadrature signals using Hermitian symmetry.
Integrating memory within the laser package eliminates external media loss while maintaining reliable access to tuning settings and manufacturing data.
Optical modulator phase shifters use specific electrode length ratios to adjust signal phases, suppressing modulation loss and power consumption.
Modulatable optical reflectors produce coherent beams with relative phase differences to enable advanced data transmission schemes.
Segment signal generation into stopband phases to isolate crosstalk and enable precompensation without increasing device complexity.
A method adjusts dither signal amplitude based on binary electrical signals to modulate optical carriers in transmitters.
Applying dither signals to bias voltages enables accurate I-Q power balance measurement in non-ideal dual parallel Mach-Zehnder modulators with inverting taps.
Vertical stacking of relay and terminal substrates around a waveguide substrate minimizes module size without compromising modulation capability or yield.
A method generates RZ-DQPSK optical signals by performing return-to-zero processing on non-return-to-zero data pairs.
Stimulus signals decouple bandwidth limitation from modulation nonlinearity, enabling independent filter compensation for high baud rate transponders.
Hierarchical electrode segmentation with optimized timing delays reduces power consumption and enables low-voltage silicon driver integration.
A bias supplying unit sweeps voltages to maximize optical output power in Mach-Zehnder modulators.
The device reduces pattern dependence and polarization sensitivity by processing signals through an intermediary correlator before wavelength conversion.
Dual-branch digital filters process input signals to generate predistorted outputs, reducing memory requirements for chromatic dispersion compensation.
A processor executes custom microcode to define operational features, resolving the inflexibility of traditional state machine controllers.