An optical transmitter includes an optical modulator includ ing a first modulator, a second
modulator, and a phase shifter that provides a predetermined optical phase difference …

To provide a modulation control method and an optical transmission device that realize high
reliability by more stably performing bias control of an optical modulator using an optical …

An optical signal transmitter of the present invention includes: two phase modulating
portions; a phase shifter which displaces carrier phases of two output lights from the phase …

There is provided an optical transmitter including a memory, a processor coupled to the
memory and the processor to generate an electric signal, an optical generator to generate …

An electro-optic device may comprise a Mach-Zehnder modulator (MZM) and one or more
components. The one or more components may apply a child DC bias with dither to arms of …

An optical communication device includes an optical modulator of a Mach-Zehnder type, a
low frequency superimposing circuit configured to superimpose a low frequency signal on a …

An electro-optic device may include a Mach-Zehnder modulator (MZM) and one or more
components. The one or more components may apply a DC bias with dither to a first branch …

The present disclosure discloses a method and an apparatus for automatically controlling a
bias voltage of an optical modulator. The method includes: calculating a new Q bias voltage …

An optical waveguide modulator with automatic bias control is disclosed. A dither signal is
applied to the modulator bias and its signature detected in light tapped from an output of the …

Abstract A Dual Parallel (DP)-Inphase/Quadrature (I/Q) Mach-Zehnder Modulator (MZM)
bias controller configured to generate a pair of orthogonal dither signals; multiply the pair of …