Method and receiver for realizing phase synchronization of coherent light

A phase synchronization and coherent optical technology, applied in the field of optical communication, can solve the problems of phase ambiguity and affect the demodulation efficiency of the receiving system, and achieve the effect of improving accuracy and avoiding phase ambiguity.

Active Publication Date: 2010-06-09
HUAWEI TECH CO LTD +1
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  • Claims
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Problems solved by technology

[0011] Since the argument angle is used for synchronization, only the phase of the argument angle range [-180°, +180°] can be detected. When the argument angle exceeds this range, the uniquely determined phase cannot be solved, and periodicity will occur. Multi-value problem, that is, phase ambiguity, which affects the demodulation efficiency of the receiving system

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  • Method and receiver for realizing phase synchronization of coherent light
  • Method and receiver for realizing phase synchronization of coherent light
  • Method and receiver for realizing phase synchronization of coherent light

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Embodiment 1

[0029] Embodiment one, see figure 1 Detailed description, figure 1 It is a schematic flow chart of the method in this embodiment.

[0030] Step 101: Perform analog / digital conversion on the mixed signal of the received coherent optical signal and the local oscillator signal, and the converted mixed frequency signal includes the frequency offset and phase noise of the coherent optical signal and the local oscillator signal .

[0031] After the coherent optical signal emitted by the transmitter is transmitted to the receiver through the optical fiber, it is usually sent to the 90-degree optical mixer first, and the local oscillator signal is usually input to the other port of the 90-degree optical mixer, and the other two mixers A port can be set to 0, i.e. ground it. After frequency mixing, the received coherent optical signal and local oscillator signal are usually respectively input into the balanced receiver, and then the output signals of the balanced receiver are passed...

Embodiment 2

[0043] Embodiment two, see figure 2 Detailed description, figure 2 It is a schematic flow chart of the method in this embodiment.

[0044] Step 201: Perform analog / digital conversion on the mixed signal of the received coherent optical signal and the local oscillator signal, and the converted mixed signal contains the frequency offset and phase noise of the coherent optical signal and the local oscillator signal .

[0045] After frequency mixing, the received coherent optical signal and local oscillator signal are usually respectively input into the balanced receiver, and then the output signals of the balanced receiver are passed through the filter respectively, and the analog / digital conversion is performed, and the converted mixed frequency signal contains all frequency offset and phase noise of the coherent optical signal and the local oscillator signal.

[0046] Step 202: Divide the mixed frequency signal into two paths, one path is input to a delay device, and the o...

Embodiment 3

[0053] Embodiment three, refer to image 3 Detailed description, image 3 It is a schematic flow chart of the method in this embodiment.

[0054] Step 301: Perform analog / digital conversion on the mixed signal of the received coherent optical signal and the local oscillator signal, and the converted mixed signal contains the frequency offset and phase noise of the coherent optical signal and the local oscillator signal .

[0055] After frequency mixing, the received coherent optical signal and local oscillator signal are usually respectively input into the balanced receiver, and then the output signals of the balanced receiver are passed through the filter respectively, and the analog / digital conversion is performed, and the converted mixed frequency signal contains all frequency offset and phase noise of the coherent optical signal and the local oscillator signal. Let the received coherent optical signal be The local oscillator signal is Among them, m(t) is the noise s...

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Abstract

The embodiment of the invention discloses a method and a receiver for realizing phase synchronization of coherent light. The method comprises the following steps that analog / digital conversion of a signal acquired after frequency mixing of a received coherent light signal and a local oscillation signal is carried out and the converted frequency mixing signal comprises the frequency deviation and phase noise of the coherent light signal and the local oscillation signal; the phase error of the frequency mixing signal is extracted by means of logarithm and comprises the frequency deviation and the phase noise; and the phase error is removed from the frequency mixing signal. The method and the receiver extract the phase error acquired after frequency mixing of the received coherent light signal and the local oscillation signal by means of logarithm and then remove the extracted phase error from the frequency mixing signal, thereby realizing the phase synchronization of the received signal and the local oscillation signal, preventing the signal of a coherent communication system from generating phase ambiguity and increasing the accuracy of the phase synchronization and the demodulation efficiency of a receiving system.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method and a receiver for realizing phase synchronization of coherent light. Background technique [0002] With the continuous high-speed growth of network bandwidth demand in recent years, the requirements for single-channel data transmission rate are getting higher and higher. Receiving technology has become a research hotspot in the field of international optical communication. Coherent light refers to two beams of light with the same vibration direction, the same vibration frequency, the same phase or a constant phase difference. Interference will occur in the area where the two beams of coherent light meet. [0003] To achieve coherent optical communication, the coherent optical signal that needs to be received is the same frequency and phase as the local oscillator signal of the receiver. However, since the light emitted by the currently used laser generally has a c...

Claims

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Application Information

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IPC IPC(8): H04B10/148H04B10/12H04B10/61
Inventor 徐晓庚乔耀军杜晓纪越峰
Owner HUAWEI TECH CO LTD
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