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High-speed optical return-to-zero code duty cycle measuring method and device thereof

A measurement method and duty cycle technology, applied in the field of optical communication, can solve the problems of complex and expensive, limited optical signal code rate, etc., and achieve the effect of simple device and low cost

Active Publication Date: 2014-12-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Application Information

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Problems solved by technology

[0007] In the field of optical communication, the duty cycle of the high-speed RZ code optical signal needs to be measured using a fast-response photodetector combined with a high-bandwidth digital sampling oscilloscope. The number rate is limited by the oscilloscope's digital sample rate and signal processing bandwidth requirements

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  • High-speed optical return-to-zero code duty cycle measuring method and device thereof
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  • High-speed optical return-to-zero code duty cycle measuring method and device thereof

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Embodiment Construction

[0032] The implementation of the present invention will be further described in detail below according to the drawings and examples. according to Figure 6 , Figure 7 , Figure 8 and Figure 9 , the main contents of the embodiments of the present invention include:

[0033] 1) The optical coupler 101 with a splitting ratio of 90:10 is used to couple 10% of the RZ code optical signal in the optical fiber link under test for the measurement of the duty cycle;

[0034] 2) performing photoelectric conversion on the coupled RZ code optical signal 107 through the photodetector 102;

[0035] 3) The converted RZ code electrical signal is divided into two RZ code electrical signals of equal power in the power divider 103;

[0036] 4) No processing is performed on one RZ code electrical signal 108, and an RZ code electrical signal 109 is obtained by 180° phase shifting using a radio frequency phase shifter 4 with an adjustable phase shift amount in another channel;

[0037] 5) Se...

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Abstract

The invention relates to a high-speed optical RZ (return-to-zero) code duty cycle measuring method and a high-speed optical RZ duty cycle measuring device, which belong to the field of optical communication. Part of RZ code optical signals are coupled by a photo-coupler from an optical link to be measured; the RZ code optical signals are converted to RZ code electric signals by use of a photoelectric converter; a power divider divides the RZ code electric signals into two equipower paths; a radio frequency phase shifter with adjustable phase shift is used to introduce 180 DEG of phase shift in one path; asynchronous drop frequency sampling and analog-to-digital conversion are performed on the two paths of RZ code electric signals in an ADC (analog-to-digital converter); and range values of feature points in two groups of sampling values are computed by a CPU (central processing unit) to figure out duty cycles of the RZ code optical signals. In the measuring method and the measuring device disclosed by the invention, the method is simple, components have low cost, and the high-speed RZ code optical signals can be monitored without limit from digital sampling rate or signal processing bandwidth in a system.

Description

technical field [0001] The invention belongs to the field of optical communication and relates to a signal monitoring method, in particular to a method and device for measuring the duty cycle of a high-speed optical return-to-zero code. Background technique [0002] The development of new Internet services such as distributed storage, cloud computing, and high-definition video has put forward higher requirements on the capacity of optical transmission networks. The bearer rate of the optical transmission backbone network is evolving from 10Gb / s to 40Gb / s and 100Gb / s. [0003] In long-distance high-speed optical transmission systems, optical line codes usually use RZ codes (Return to Zero, return-to-zero codes), mainly including RZ-OOK codes (Return to Zero-On Off Keying, Return to Zero-On Off Keying, which use intensity modulation format). Zero switch keying code); RZ-PSK code (Return to Zero–Phase Shift Keying, return to zero phase shift keying code) in phase modulation fo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/07H04B10/077
Inventor 赖俊森杨爱英孙雨南左林
Owner BEIJING INSTITUTE OF TECHNOLOGYGY