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US 12,003,275 B2Granted
Clock synchronization apparatus, optical transmitter, optical receiver, and clock synchronization method
AssigneeHuawei Technologies Co., Ltd.
InventorsJun Chen, Zhuhong Zhang, Chuandong Li, Jin Wan, Zhikui Yong
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Abstract
A clock synchronization apparatus, an optical transmitter, an optical receiver, and a clock synchronization method are provided. In the clock synchronization apparatus, a digital interpolator adjusts a sampling clock frequency of a digital signal under sampling clock control of a clock control circuit.
Claims19
An optical transmitter, comprising:
- a digital interpolator;
- a digital delay element;
- and
- a clock control circuit;
- wherein the digital interpolator is configured to perform sampling clock adjustment on a received first digital signal under phase control of the clock control circuit, to obtain a second optical digital signal;
- wherein the digital delay element is configured to delay the second optical digital signal, to obtain a third optical digital signal;
- and
- wherein the clock control circuit is configured to:
- detect sampling clocks of the second optical digital signal and the third optical digital signal, to obtain a sampling clock deviation;
- generate a clock control signal based on the sampling clock deviation;
- and
- perform sampling clock control on the digital interpolator based on the clock control signal.
9 more elements
An optical receiver, comprising:
- a phase-locked loop, configured to generate a clock signal with a fixed sampling frequency;
- an analog-to-digital converter, configured to convert a received analog signal into a third digital signal based on the clock signal;
- a digital sampler, configured to perform time-domain downsampling on the third digital signal, to obtain a first digital signal;
- a clock control circuit;
- and
- a digital interpolator, configured to perform sampling clock adjustment on the first digital signal under sampling clock control of the clock control circuit, to obtain a second digital signal;
- and
- wherein the clock control circuit is configured to:
- generate a timing recovery control signal based on the second digital signal;
- and
- perform sampling clock control on the digital interpolator based on the timing recovery control signal.
8 more elements
An optical transceiver apparatus, comprising:
- an optical transmitter;
- and
- an optical receiver;
- wherein the optical transmitter comprises a first digital interpolator, a digital delay element, and a first clock control circuit;
- wherein the first digital interpolator is configured to perform sampling clock adjustment on a received first digital signal under phase control of the first clock control circuit, to obtain a second optical digital signal;
- wherein the digital delay element is configured to delay the second optical digital signal, to obtain a third optical digital signal;
- wherein the first clock control circuit is configured to:
- detect sampling clocks of the second optical digital signal and the third optical digital signal, to obtain a sampling clock deviation;
- generate a clock control signal based on the sampling clock deviation;
- and
- perform sampling clock control on the first digital interpolator based on the clock control signal;
- wherein the optical receiver comprises a second digital interpolator and a second clock control circuit;
- wherein the second digital interpolator is configured to perform sampling clock adjustment on a received fifth digital signal under sampling clock control of the second clock control circuit, to obtain a sixth digital signal;
- and
- wherein the second clock control circuit is configured to:
- generate a timing recovery control signal based on the sixth digital signal;
- and
- perform sampling clock control on the second digital interpolator based on the timing recovery control signal.
15 more elements
Dependencies are inferred from the claim text.