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Method for measuring gain and noise factor of erbium-doped fiber amplifier

A technology for amplifier gain and noise figure, applied in lasers, laser components, transmission systems, etc., can solve problems such as difficult measurement of EDFA gain and noise figure, high cost of spectrometers, expensive peripheral equipment, etc., to reduce measurement costs and simplify the method , The effect that the equipment is easy to obtain

Inactive Publication Date: 2008-05-07
天津市金飞博科技有限公司
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Problems solved by technology

[0007] The above-mentioned methods all have relatively expensive peripheral equipment, such as electric spectrometers, and the cost of spectrometers is relatively high, which brings difficulties to the measurement of EDFA gain and noise figure

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  • Method for measuring gain and noise factor of erbium-doped fiber amplifier
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  • Method for measuring gain and noise factor of erbium-doped fiber amplifier

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Embodiment Construction

[0026] Below, the present invention will be described in further detail in conjunction with the accompanying drawings and specific embodiments.

[0027] The working principle of erbium-doped fiber amplifier (EDFA) is: Figure 4 Er as shown 3+ Energy level diagram, Er 3+ Absorb the energy of sufficiently strong pump light, so that in the ground state 4 I 15 / 2 The ion transitions to the pumped state at a high energy level, and the electrons transition to different energy levels for different pump wavelengths. When pumped with 980nm wavelength light, Er +3 Transition from ground state to pumped state 4 I 11 / 2 . Since the lifetime of the carriers in the pumped state is only 1 μs, the electrons rapidly relax from the pumped state to the metastable state in a non-radiative manner 4 I 13 / 2 , the lifetime of carriers in the metastable state is longer, and under continuous pumping, the number of particles in the metastable state continues to increase, thereby realizing the reve...

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Abstract

The present invention discloses a method for measuring the gain and noise coefficients of the erbium-doped optical amplifier; the measurement comprises the following steps that a DFB light source can be input into a filter through a variable optical attenuator; the output end of the filter is connected with an optical power meter to obtain the input power Pin of EDFA; the input end of the EDFA is suspended and the flat region of the ASE spectrum in the EDFA is utilized for obtaining the ASE power PASE which is in the filter band width from the optical power meter; the DFB light resource signal can be emitted into the EDFA through the variable optical attenuator and the signal amplified by the EDFA and the ASE mixing power Pout are obtained from the optical power meter through the filter; by alternating the variable optical attenuator value, the EDFA gain and noise coefficient curves can be calculated and described. The beneficial effect is that the present invention utilizes the flat region of the ASE spectrum in the EDFA to match with a band-pass filter which can fast and accurately calculate EDFA gain and noise coefficients. The test method of the present invention is simple which greatly reduces measurement cost.

Description

technical field [0001] The invention relates to an optical fiber amplifier, in particular to a method for measuring gain and noise figure in an erbium-doped optical fiber amplifier. Background technique [0002] At present, the optical fiber amplifier in the market is an indispensable key device in the optical fiber communication system. It not only can directly amplify the optical signal, but also has the function of real-time, high gain, broadband, online, low noise, and low loss all-optical amplification. Fiber amplifiers mainly include Erbium-Doped Fiber Amplifier (EDFA), Semiconductor Optical Amplifier (SOA) and Fiber Raman Amplifier (FRA), among which Erbium-Doped Fiber Amplifier is widely used in long-distance, Large-capacity, high-speed optical fiber communication systems, access networks, optical fiber CATV networks, military systems (radar multiple data multiplexing, data transmission, guidance, etc.) and other fields. [0003] EDFA has three basic application met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/08H04B10/04H01S3/00H04B10/073
Inventor 胡志雄葛春风祖鹏
Owner 天津市金飞博科技有限公司
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