Coherent transmitter, method for controlling coherent transmitter and coherent transceiving system
A transmitter and controller technology, applied in the field of optical communication, can solve the problems of poor coherent signal quality and deviation of the 90° phase shift of the thermal regulator, and achieve the effects of easy integration, improved phase adjustment accuracy, and low power consumption
Active Publication Date: 2021-07-20
HUAWEI TECH CO LTD
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Problems solved by technology
However, in the process of signal modulation, there may be a deviation in the 90° phase shift due to the instability of the thermal regulator, which makes the quality of the modulated coherent signal worse
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[0053] Embodiments of the present application provide a coherent transmitter, a method for controlling the coherent transmitter, and a coherent transceiver system. On the premise of not affecting service transmission, the phase difference after phase adjustment can be monitored in real time, and the phase difference can be controlled within the preset range, which improves the phase adjustment accuracy and makes the coherent signal quality of coherent design modulation better. In addition, the structure of the coherent transmitter does not need complex electrical devices such as ADC and DAC, which is convenient for integration, and has lower device cost and lower power consumption. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the terms so use...
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The embodiment of the invention discloses a coherent transmitter, a method for controlling the coherent transmitter and a coherent transceiving system. The coherent transmitter comprises a first modulator, a second modulator, a first beam splitter, a phase shift adjustment unit, a first beam combiner, a second beam combiner, a first PD and a controller. The first beam splitter splits an input first optical signal to obtain a second optical signal and a third optical signal; the first modulator modulates the second optical signal to obtain a first modulation signal; the phase shift adjustment unit performs phase adjustment on a first sub-signal in the first modulation signal and performs phase adjustment on a fourth sub-signal in the first sub-signal after phase adjustment; the first beam combiner combines the second sub-signal in the first modulation signal and the fourth sub-signal after phase adjustment to obtain a first combined signal; the first PD performs photoelectric conversion on the first combined signal to obtain a first electric signal; and the controller controls the voltage loaded on the phase shift adjusting unit according to the first electric signal.
Description
technical field [0001] The present application relates to the field of optical communication, and in particular to a coherent transmitter, a method for controlling the coherent transmitter, and a coherent transceiving system. Background technique [0002] In recent years, with the rapid increase in the amount of information exchange within and between data centers, the direct modulation mode is limited by device bandwidth, making it difficult to meet the requirements of single-wavelength 200G or even single-wavelength 400G. The coherent modulation mode is favored for its high spectral efficiency and high single-wave modulation rate, and will be gradually applied to short-distance optical transmission systems. [0003] Coherent modulation requires a 90° phase shift between In-phase and Quadrature (I / Q) signals. The usual design is to realize by loading a certain voltage on the heat regulator (heater) of the integrated chip. However, in the signal modulation process, there m...
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IPC IPC(8): H04B10/556H04B10/61
CPCH04B10/556H04B10/6165H04B10/61H04B10/516H04B10/5053H04B10/5057H04B10/40
Inventor 李芮孙旭宋小鹿
Owner HUAWEI TECH CO LTD