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US 10,122,467 B2Granted
Optical transmitter and control method for optical transmitter
AssigneeFujitsu Optical Components Limited
InventorHiroshi Nishimoto
Life of this patent
Estimating the term…
Abstract
An optical transmitter that transmits an optical signal includes a dither superimposing circuit configured to generate a dither signal, the dither signal being used to control an operation of the optical transmitter to output the optical signal, and a control circuit configured to control intermittent superimposition of the dither signal onto a target to be controlled.
Claims13
An optical transmitter that transmits an optical signal:
- comprising:
- a dither superimposing circuit configured to generate a dither signal, the dither signal being used to control an operation of the optical transmitter to output the optical signal;
- a control circuit configured to control intermittent superimposition of the dither signal onto a target to be controlled;
- and
- an optical modulator configured to modulate a light beam emitted from a light source with an electrical data signal,
- wherein the optical modulator has a first Mach-Zehnder modulator and a second Mach-Zehnder modulator, and
- wherein the control circuit is configured to apply the intermittent superimposition of the dither signal to
- a first control operation for controlling an optical phase of the light beam travelling through the first Mach-Zehnder modulator,
- a second control operation for controlling an optical phase of the light beam travelling through the second Mach-Zehnder modulator, and
- a third control operation for controlling a phase difference between the light beams travelling through the first Mach-Zehnder modulator and the second Mach-Zehnder modulator.
7 more elements
An optical communication system comprising:
- an optical transmitter that transmits an optical signal, the optical transmitter having
- a dither superimposing circuit configured to generate a dither signal, the dither signal being used to control an operation of the optical transmitter to output the optical signal,
- a control circuit configured to control intermittent superimposition of the dither signal onto a target to be controlled, and
- an optical modulator configured to modulate a light beam emitted from a light source with an electrical data signal;
- and
- an optical receiver connected to the optical transmitter by an optical transmission path,
- wherein the optical modulator has a first Mach-Zehnder modulator and a second Mach-Zehnder modulator, and
- wherein the control circuit is configured to apply the intermittent superimposition of the dither signal to
- a first control operation for controlling an optical phase of the light beam travelling through the first Mach-Zehnder modulator,
- a second control operation for controlling an optical phase of the light beam travelling through the second Mach-Zehnder modulator, and
- a third control operation for controlling a phase difference between the light beams travelling through the first Mach-Zehnder modulator and the second Mach-Zehnder modulator.
8 more elements
A control method for an optical transmitter that transmits an optical signal, comprising:
- generating a dither signal, the dither signal being used to control an operation of the optical transmitter to output the optical signal, and
- controlling intermittent superimposition of the dither signal onto a target to be controlled,
- wherein the target to be controlled is an optical modulator having a first Mach-Zehnder modulator and a second Mach-Zehnder modulator, and
- wherein the controlling includes applying the intermittent superimposition of the dither signal to
- a first control operation for controlling an optical phase of a light beam travelling through the first Mach-Zehnder modulator,
- a second control operation for controlling an optical phase of the light beam travelling through the second Mach-Zehnder modulator, and
- a third control operation for controlling a phase difference between the light beams travelling through the first Mach-Zehnder modulator and the second Mach-Zehnder modulator.
4 more elements
Dependencies are inferred from the claim text.