Device for locking gain and power in erbium-doped fiber amplifier (EDFA) by using digital signal processor (DSP)

A power locking and amplifier technology, applied in the field of communication, can solve the problems of difficult transient and steady-state indicators, single control means, and system instability, and achieve the effect of avoiding delay, flexible control means and maintaining stability

Active Publication Date: 2010-11-03
WUXI TACLINK OPTOELECTRONICS TECH CO LTD
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Problems solved by technology

The traditional control unit is composed of analog devices, and the control method is relatively simple. It is difficult to achieve some demanding transient and stead

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  • Device for locking gain and power in erbium-doped fiber amplifier (EDFA) by using digital signal processor (DSP)
  • Device for locking gain and power in erbium-doped fiber amplifier (EDFA) by using digital signal processor (DSP)
  • Device for locking gain and power in erbium-doped fiber amplifier (EDFA) by using digital signal processor (DSP)

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Embodiment Construction

[0021] The digital EDFA based on DSP as the control unit is mainly used for the power amplification of the optical channel in the optical transmission system. The main functions include intermediate access, adjustable gain, optional working mode, and intelligent communication. For the hardware block diagram of the whole system, see figure 1 .

[0022] The main functional modules of the hardware realization of the digital EDFA include ARM (Advanced RISC Machines) and DSP. The design idea of ​​the digital EDFA is to completely separate the MCU and the control, and realize the connection between the ARM and the DSP in a master-slave manner. DSP's own UHPI (Universal Host Port Interface) interface and ARM's external expansion bus realize seamless connection. ARM can access the dual-port RAM inside the DSP through UHPI to realize information exchange with the DSP. ARM can set control parameters and control mode automatic current control ACC (Automatic Current Control), automatic...

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Abstract

The invention aims to provide a device for locking gain and power in an erbium-doped fiber amplifier (EDFA) by using a digital signal processor (DSP). The conventional closed-loop analog control unit is replaced by the DSP, an analog-to-digital (A/D) converter, and a digital-to-analog (D/A) converter; and a high-efficiency and flexible control algorithm is realized in the DSP by using a software mode. The whole control flow comprises the following steps that: four A/D sampling chips of a 14-bit Texas instrument (TI) sample input and output optical power at two stages respectively; after reading the input and output optical power, the DSP of the TI calculates final output optical power by combining amplified spontaneous emission (ASE) compensating power according to the current control mode and the set value of gain or output optical power; and control voltage for driving pump lasers is calculated through a feedforward compensation proportional-integral-differential (PID) control algorithm, and one D/A chip with a 14-bit TI dual channel controls two pump lasers. The one-time control period of the whole closed-loop control system is about 2mu s. The gain and power can be effectively locked and transient and steady indexes of a user are met by coordinating set control parameters.

Description

technical field [0001] The invention relates to an optical transmission system in the communication field, in particular to gain and power locking of an erbium doped fiber amplifier (EDFA, Erbium Doped Fiber Amplifier) ​​in a wavelength division multiplexing (WDM, Wavelength Division Multiplexing) system. Background technique [0002] With the commercialization of EDFA in the 1990s, it has changed the process that optical signals in the system need to be amplified through electro-optical conversion with strong advantages. The practical application of erbium-doped fiber amplifiers not only realizes direct optical amplification, but also saves a lot of regenerative repeaters. , so that the fiber loss in transmission is no longer the main problem; at the same time, it makes the transmission link "transparent", simplifies the system, expands the transmission capacity by several times or dozens of times, and promotes dense wavelength division multiplexing in the true sense. The r...

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Application Information

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IPC IPC(8): H04B10/17H04B10/293
Inventor 顾乃宁
Owner WUXI TACLINK OPTOELECTRONICS TECH CO LTD
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