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Optical fiber network sensing system

A technology of sensing system and optical fiber network, applied in the field of sensing system based on passive optical network, can solve the problems of inability to realize security monitoring, and achieve the requirements of reducing complexity and real-time performance, long detection distance, and reducing burden. Effect

Inactive Publication Date: 2008-12-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Therefore, although distributed sensing technology is adopted, the sensing laser light is received and processed at the receiving end uniformly. Since the back Rayleigh scattered light of each branch overlaps together and cannot be separated, and the sensing light source is broadband light source, so it can only monitor the fault of the optical cable in the PON structure, and cannot realize the security monitoring function

Method used

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  • Optical fiber network sensing system
  • Optical fiber network sensing system
  • Optical fiber network sensing system

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Embodiment

[0017] Such as image 3 As shown, the optical fiber network sensing system in this example includes OLT, 1×n beam splitter, n ONUs, n circulators (in consideration of cost saving, 5:5 couplers can also be used instead of circulators), n OTDR processing modules, n+1 WDMs and lasers and modulators. Because the central wavelength of the sensing laser emitted by the selected laser is far from the communication laser, for example, the uplink / downlink wavelength of EPON is 1490 / 1310nm, and the narrow linewidth laser center wavelength can be selected as 1550nm, so CWDM can be used to directly separate the communication laser and sensing lasers, all WDMs in this example use the lower-cost CWDM. Each circulator is connected to the CWDM through an optical amplifier, which can compensate the attenuation caused by optical transmission.

[0018] After the sensing laser generated by the laser is modulated by the modulator, it is fused with the communication laser emitted by the OLT throug...

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Abstract

The invention relates to a distributed fiber-optic sensor distributed fiber sensor, particularly to a sensing system based on a passive optical network (PON). The invention discloses a fiber optic network sensing system based on the wavelength division multiplexer and the distributed processing technique to overcome the deficiency aiming at the drawback which the sensing system can not recognize and detect each OUN branch optical path. The technical scheme is that, a sensing network is arranged in the prior PON system through using the ONU branch, to perform the distributed sensing laser receiving and processing, which reduces the request of the complexity and the real-time, applied in each PON structure at present free of the restrict of the PON standard restrain.

Description

technical field [0001] The present invention relates to distributed fiber optic sensors, and more particularly to passive optical network (PON) based sensing systems. Background technique [0002] Next-Generation Network (NGN) and Next-Generation Internet (NGI) are a comprehensive open network architecture that can provide various services. The five "medium- and long-term science and technology planning focuses on supporting directions, among which access network technology and switching technology are the focus of NGN and NGI research. The trend of "light into copper" in my country is accelerating, point-to-point applications for commercial users have become increasingly popular, PON has become FTTB, FTTC, FTTO, FTTH (fiber access technology, collectively referred to as FTTx, including Fiber to the building, Fiber to the curb, Fiber to the office, Fiber to the home). The current mainstream PON includes Ethernet PON (EPON for short) and Gigabit PON (GPON for short), and its...

Claims

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Application Information

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IPC IPC(8): H04B10/20H04L12/28H04B10/25
Inventor 冉曾令饶云江熊森罗力伟
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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