US 2025/0080228 A1 · DELAY CONTROL CIRCUIT, OPTICAL TRANSMITTER, AND DELAY CONTROL METHOD

Abstract

A delay control circuit includes a delay circuit configured to delay, by a predetermined delay, a signal input to a plurality of electrode segments provided in series along one or both of two waveguides of a Mach-Zehnder interferometer of an optical modulator, a monitor configured to monitor a power of a baud rate frequency component including a frequency having a value that is equal to a baud rate or an integer multiple of the baud rate, or a power of a beat frequency component of the baud rate frequency component, from output light of the optical modulator, and a control circuit configured to control a delay amount of the delay circuit so as to maximize a monitored power of the baud rate frequency component or the beat frequency component.

Claims13

Dependent claims

A delay control circuit comprising:

a delay circuit configured to delay, by a predetermined delay, a signal input to a plurality of electrode segments provided in series along one or both of two waveguides of a Mach-Zehnder interferometer of an optical modulator;
a power monitor configured to monitor a power of a baud rate frequency component including a frequency having a value that is equal to a baud rate or an integer multiple of the baud rate, or a power of a beat frequency component of the baud rate frequency component, from output light of the optical modulator;
and
a control circuit configured to control a delay amount of the delay circuit so as to maximize a monitored power of the baud rate frequency component or the beat frequency component.

1 more element

An optical transmitter comprising:

a digital signal processor;
an optical modulator driven by signal bits output from the digital signal processor;
a delay control circuit configured to control a delay amount of the signal bits input to the optical modulator;
and
a photodetector configured to detect a portion of output light of the optical modulator and output a detection result to the delay control circuit,
wherein the delay control circuit controls the delay amount of the signal bits so as to maximize a power of a baud rate frequency component including a frequency having a value equal to a baud rate or an integer multiple of the baud rate or a power of a beat frequency component of the baud rate frequency component, included in a detection result of the photodetector.

3 more elements

Dependencies are inferred from the claim text.

Delay control circuit, optical transmitter, and delay control method

Life of this patent

Delay control circuit, optical transmitter, and delay control method

Life of this patent

Abstract

Claims13