Method and apparatus for generating differential quadrature phase shifting keying code optical signal

A differential quadrature phase shift and optical signal technology, applied in the field of communication, can solve the problems of unstable light intensity, the influence of the Y branch optical splitter is very important, and complex implementation, so as to eliminate the inconsistent light intensity ratio and avoid output light intensity jitter , the effect of reducing requirements

Inactive Publication Date: 2009-08-12
HUAWEI TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main disadvantages of this solution are: First, the Y branch splitter has a very important impact on the entire device
The Y-branch optical splitter needs to split the optical signal into two optical signals with the same optical intensity, which is complicated and expensive to implement.
Second, it is difficult to control the light intensity percentages of the X polarization component and the Y polarization component of the two-way light, which will lead to instability of light intensity, thereby deteriorating the trans

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  • Method and apparatus for generating differential quadrature phase shifting keying code optical signal
  • Method and apparatus for generating differential quadrature phase shifting keying code optical signal
  • Method and apparatus for generating differential quadrature phase shifting keying code optical signal

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Embodiment 1

[0032] In order to improve the performance of the system, the embodiment of the present invention provides a method for generating a DQPSK optical signal. The method can stably generate a DQPSK optical signal through light splitting processing, modulation and phase shift processing, light combining processing, and polarization processing, thereby effectively Help to improve system performance. see image 3 , the concrete steps of the embodiment of the present invention are as follows:

[0033] Step 101: After the input optical signal is processed by a PBS (Polarization Beam Splitter, polarization beam splitter), an X-polarized optical signal and a Y-polarized optical signal are obtained, and the obtained X-polarized optical signal is input to the first MZM, and the Y-polarized optical signal is input Second MZM.

[0034] It should be noted that the PBS can directly divide the optical signal into X-polarized optical signal and Y-polarized optical signal by using the birefring...

Embodiment 2

[0046] An embodiment of the present invention provides a device for generating DQPSK optical signals. The device can stably generate DQPSK optical signals through light splitting processing, modulation and phase shift processing, light combining processing, and polarization processing, thereby improving system performance. see Figure 5 , the device consists of:

[0047] The polarization beam splitter is used for splitting the optical signal to obtain X-polarized optical signal and Y-polarized optical signal, and input the X-polarized optical signal to the first MZM, and the Y-polarized optical signal to the second MZM.

[0048] It should be noted that, it is also possible to input the Y-polarized light signal into the first MZM, and the X-polarized light signal into the second MZM. The effect achieved by such processing is the same as the effect achieved by inputting the X-polarized light signal into the first MZM and the Y-polarized light signal into the second MZM.

[004...

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Abstract

The invention discloses a method and a device for producing a differential quadrature phase-shift keying code optical signal, which belong to the field of communication. The method comprises the steps of: performing light-splitting processing on an optical signal to obtain two polarized light signals; performing modulation and phase-shift processing on one of the polarized light signals to obtain a polarized light signal after the phase shift, and modulating the other polarized light signal to obtain another polarized modulated light signal; performing light combination processing on the polarized light signal after the phase shift and another polarized modulated light signal to obtain a polarization-multiplexed optical signal; and performing polarization processing on the polarization-multiplexed optical signal to obtain the differential quadrature phase-shift keying code optical signal. The device comprises a polarization light splitter, a modulator, a phase-shift controller, a polarization light combiner and a polarizer. The method and the device can steadily produce the differential quadrature phase-shift keying code optical signal through light-splitting processing, modulation and phase-shift processing, light combination processing and polarization processing.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and a device for generating a differential quadrature phase-shift keying code optical signal. Background technique [0002] The increase of video services in the network imposes higher requirements on the capacity of the entire network. Therefore, it is now required to upgrade the rate of the optical network, and the rate of the next-generation optical network is 40Gb / s and higher. For example, the rate of Ethernet is upgraded at a speed of 10 times, and 100GE is currently under discussion, and 100Gb / s optical transmission technology has become a hot issue today. [0003] For the 40Gb / s optical transmission system, there are various optical modulation code types, such as NRZ (Non-Return-to-Zero, non-return-to-zero) code, RZ (Return-to-Zero, return-to-zero) code, CSRZ (Carrier Suppressed Retum-to-Zero, carrier suppressed return to zero) code, ODB (Optical Duobinary, optical du...

Claims

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Application Information

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IPC IPC(8): H04B10/135H04B10/14H04B10/50H04B10/532H04B10/556
CPCH04B10/5053H04J14/06H04B10/532H04B10/5561G02F2001/212H04L27/34G02F1/212
Inventor 徐晓庚吕超
Owner HUAWEI TECH CO LTD
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