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US 10,097,277 B2Granted
Optical modulator bias locking
AssigneeFuturewei Technologies, Inc.
InventorsXueyan Zheng, Jianying Zhou, Xiao Shen, Chunlei Liao, Hongbing Lei, Hongmin Chen, Yu Sheng Bai
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Abstract
An apparatus comprises: a first input tap; a first optical modulator coupled to the first input tap; a first output tap coupled to the first optical modulator so that the first optical modulator is positioned between the first input tap and the first output tap; and a controller indirectly coupled to the first input tap and the first output tap.
Claims19
An apparatus comprising:
- a laser diode (LD);
- a first input tap coupled to the LD;
- a first optical modulator coupled to the first input tap;
- a first output tap coupled to the first optical modulator so that the first optical modulator is positioned between the first input tap and the first output tap;
- a first monitoring photodiode (MPD) coupled to the first input tap;
- a first amplifier coupled to the first MPD;
- a first analog-to-digital converter (ADC) coupled to the first amplifier;
- and
- a controller indirectly coupled to the first input tap and the first output tap and coupled to the LD and the first ADC so that the first input tap, the first MPD, the first amplifier, and the first ADC are positioned between the LD and the controller.
6 more elements
An apparatus comprising:
- a first input tap;
- a first optical modulator coupled to the first input tap;
- a first output tap coupled to the first optical modulator so that the first optical modulator is positioned between the first input tap and the first output tap;
- a controller indirectly coupled to the first input tap and the first output tap;
- a switch coupled to the controller;
- a first laser diode (LD) coupled to the switch and the first input tap;
- a second LD coupled to the switch;
- a second input tap coupled to the second LD;
- a second optical modulator coupled to the second input tap;
- and
- a second output tap coupled to the second optical modulator so that the second optical modulator is positioned between the second input tap and the second output tap,
- the controller is indirectly coupled to the second input tap and the second output tap.
9 more elements
An apparatus comprising:
- a controller configured to generate an electrical bias signal and an electrical dither signal;
- a laser diode (LD) configured to:
- receive the electrical bias signal from the controller;
- convert the electrical bias signal into an optical bias signal;
- receive the electrical dither signal from the controller;
- convert the electrical dither signal into an optical dither signal;
- and
- combine the optical bias signal and the optical dither signal to generate an input optical signal;
- and
- an optical modulator configured to generate an output modulator signal based on the input optical signal;
- wherein the controller is further configured to:
- generate a locking signal;
- pass the locking signal to the optical modulator to adjust a phase difference of the optical modulator;
- and
- adjust the locking signal based on the optical dither signal.
12 more elements
A method comprising:
- generating, by a controller, an electrical bias signal and an electrical dither signal;
- receiving, by a laser diode (LD) and from the controller, the electrical bias signal;
- converting, by the LD, the electrical bias signal into an optical bias signal;
- receiving, by the LD and from the controller, the electrical dither signal;
- converting, by the LD, the electrical dither signal into an optical dither signal;
- combining, by the LD, the optical bias signal and the optical dither signal to generate an input optical signal;
- generating an output modulator signal based on the input optical signal;
- generating a locking signal;
- passing the locking signal to adjust a phase difference of an optical modulator;
- and
- adjusting the locking signal based on the optical dither signal.
8 more elements
Dependencies are inferred from the claim text.