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Offset drift compensation device, received signal recovery device and receiver

A receiving signal and drift compensation technology, which is applied in the field of communication, can solve problems such as unbalance, bias drift, and the normal bias point of the modulator cannot be accurately guaranteed, and achieves the effect of simple structure and wide application range

Active Publication Date: 2018-05-25
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as ambient temperature and laser center wavelength drift, the normal bias point of the modulator cannot be accurately guaranteed, resulting in bias drift, resulting in In-phase and Quadrature (IQ) in the transmitted signal. )unbalanced

Method used

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  • Offset drift compensation device, received signal recovery device and receiver
  • Offset drift compensation device, received signal recovery device and receiver
  • Offset drift compensation device, received signal recovery device and receiver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] figure 1 is a schematic diagram of the offset drift compensation device of the modulator at the transmitting end according to Embodiment 1 of the present invention. Such as figure 1 As shown, the device 100 includes:

[0030] The first compensation unit 101 is configured to compensate the IQ imbalance generated by the received signal at the receiving end at the receiving end;

[0031] A first equalization unit 102, configured to perform equalization processing on the compensated received signal;

[0032] The first estimation unit 103 is configured to estimate the frequency difference between the transmitting-end laser and the receiving-end laser and the phase noise of the transmitting-end laser and the receiving-end laser according to the equalized received signal;

[0033] A recovery unit 104, configured to perform phase recovery on the compensated received signal according to the estimated frequency difference and the phase noise;

[0034] The second compensation ...

Embodiment 2

[0074] An embodiment of the present invention also provides a received signal recovery device, which includes the device for offset drift compensation of a transmitter modulator according to Embodiment 1 of the present invention. Figure 5 It is a schematic diagram of the received signal recovery device according to Embodiment 2 of the present invention. Such as Figure 5 As shown, the device 500 includes:

[0075] Bias drift compensation device 501;

[0076] The second equalization unit 502 is configured to perform equalization processing on the received signal after the IQ imbalance caused by the bias drift of the transmitter modulator is compensated;

[0077] A third compensation unit 503, configured to perform residual phase compensation on the equalized received signal;

[0078] An output unit 504, configured to judge the received signal after residual phase compensation and output the received signal.

[0079] In this embodiment, the structure and function of the off...

Embodiment 3

[0086] The embodiment of the present invention also provides a receiver, Figure 6 It is a schematic diagram of the composition of the receiver according to Embodiment 3 of the present invention. Such as Figure 6 As shown, the receiver 600 includes an offset drift compensation device or a received signal recovery device 601 of the modulator at the transmitting end, and the structure and function of the offset drift compensation device or the received signal recovery device 601 of the modulator at the transmitting end are the same as in Embodiment 1 Or the description in Embodiment 2 is the same, and will not be repeated here.

[0087] Figure 7 It is a schematic block diagram of the system configuration of the receiver according to Embodiment 3 of the present invention. Such as Figure 7 As shown, the receiver 900 includes:

[0088] The function of the front end is to convert the input optical signal into baseband signals in two polarization states. In the embodiment of ...

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Abstract

The embodiment of the invention provides an offset drift compensation device, a received signal recovery device and a receiver. Estimation and compensation of offset drift are directly carried out ata receiving end; an offset control circuit does not need to be additionally arranged at a transmitting end; therefore, a system is simple in structure; furthermore, the system is suitable for all kinds of modulation formats, is wide in application range, and also can satisfy requirements of a high-order modulation format; in addition, due to equalization processing on a received signal and phase recovery for frequency difference and phase noise, offset point information of a transmitter modulator can be accurately separated out; and thus, the offset drift of the transmitter modulator can be precisely compensated.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to an offset drift compensating device, a receiving signal restoring device and a receiver. Background technique [0002] In a high-speed optical communication system, it is generally necessary to set a modulator at the transmitting end to modulate the transmitted signal, and a vector modulator is widely used. The vector modulator can move the spectrum in the electrical domain to near the optical frequency without loss, and combine it with the coherent monitoring technology at the receiver to achieve high spectrum utilization. In recent years, digital signal processing (DSP) algorithms for link impairment and receiver unbalance characteristics have been proposed one after another. Based on this, the transmission capacity and modulation format of optical communication systems have been continuously increased and expanded. [0003] For high-capacity optical communicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/38H04B10/50H04B10/61
CPCH04B10/50595H04B10/6164H04L27/3863H04B10/6165H04B10/6166H04J14/06H04B10/6161H04B10/614H04B10/6971H04B10/2575H04B10/516
Inventor 樊洋洋陶振宁
Owner FUJITSU LTD