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Broadband low-noise analog front end circuit for optical fiber instant fracture detection system

An analog front-end circuit, broadband and low-noise technology, applied to logic circuits using optoelectronic devices, logic circuits using specific components, transmission systems, etc. Instability, slow response speed and other problems, to avoid signal distortion, excellent isolation effect, improve the effect of response speed

Active Publication Date: 2017-06-13
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The time resolution of the existing optical fiber transient detection system is on the order of microseconds, and it is impossible to effectively detect the characteristic information of transient interruptions on the nanosecond level. The main reason is that the analog front end of the detection system will appear Excessive noise, slow response, unstable system, etc.

Method used

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  • Broadband low-noise analog front end circuit for optical fiber instant fracture detection system
  • Broadband low-noise analog front end circuit for optical fiber instant fracture detection system
  • Broadband low-noise analog front end circuit for optical fiber instant fracture detection system

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0036] like figure 1 Shown is a schematic structural diagram of a broadband low-noise analog front-end circuit for an optical fiber transient detection system provided in this embodiment, which consists of a photodiode, a transimpedance amplification module 1, an operational amplifier isolation sub-module 2, a gain control module 3, The coupling isolation sub-module 4, the bandwidth control module 5 and the level shifting module 6 are composed. The signal conditioning process of the circuit is as follows: the input optical power signal is converted into a current signal through a pho...

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Abstract

The invention relates to a broadband low-noise analog front end circuit for an optical fiber instant fracture detection system. The circuit comprises a photodiode, a transimpedance amplifier module, a gain control module, a bandwidth control module and a level movement module. The system also is equipped with an isolation module which is connected with the transimpedance amplifier module, the gain control module and the bandwidth control module. Compared with the prior art, the circuit has the advantages of large dynamic range, simple control, fast response speed, low noise and satisfaction of a nanosecond level demand of the optical fiber instant fracture detection system.

Description

technical field [0001] The invention relates to the field of optical fibers, in particular to a broadband low-noise analog front-end circuit for an optical fiber instantaneous break detection system. Background technique [0002] Optical fiber is the main information transmission channel of optical communication network. Under the influence of external factors such as high and low temperature, vibration, etc., the optical fiber may break instantaneously, referred to as optical fiber instantaneous break. Instantaneous fiber breaks will cause data errors at the receiving end, worsen the bit error rate of the system, increase the probability of data retransmission, and affect system performance. In my country's military testing standard GJB915A-97 "Fiber Optics Test Methods", method 305 stipulates the testing standard of "Measurement of Optical Discontinuity of Fiber Optic Components", and foreign countries also have corresponding optical fiber transient detection indicators. ...

Claims

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Application Information

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IPC IPC(8): H04B10/075H03K19/14H03K19/0175H03G3/30
CPCH03G3/3084H03K19/017509H03K19/14H04B10/075
Inventor 蒋万里唐旻
Owner SHANGHAI JIAO TONG UNIV
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