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Low noise index gain blocked erbium-doped amplifier

An erbium-doped fiber, gain-clamping technology, applied in the field of optical communication, can solve problems such as low noise figure

Inactive Publication Date: 2003-10-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a kind of low noise figure gain clamping erbium-doped fiber amplifier, by using a wavelength interleaver (Interleaver) of 100G / 200G in the optical path, the gain is clamped, Solve the above two problems that exist in the traditional gain-clamping erbium-doped fiber ring amplifier, that is, the amplified signal light can not be output separately from the laser, and due to the co-propagation of the signal light and the laser and the filtering of the wavelength interleaver effect, resulting in a lower noise figure

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Experimental program
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Effect test

Embodiment 1

[0019]A 50:50 optical coupler is used to couple the single-wavelength tunable light source and the multi-wavelength high-stable laser source together as the input signal source of the amplifier. First, 1554.97nm signal light is selected as the reference signal light. During the measurement process, adjust the two lasers to ensure that the input power of the 1554.97nm signal light at the output port of the 50:50 optical coupler remains -20dBm. Measurements of the single-wavelength amplified signal were performed with the multi-wavelength laser turned off. When the cavity loss is 16dB, the output powers of 1554.97nm signal light under multi-channel and single-channel input conditions are respectively -7.60dBm and -7.30dBm. Through this experiment, it can be concluded that under two different input conditions, the gain difference of the same signal light is negligible, and it also shows that in the amplifier of the present invention, when the cavity loss is 16dB, no matter how m...

Embodiment 2

[0021] In order to demonstrate the gain locking characteristics of the amplifier of the present invention under different input powers, it is necessary to measure the gain-input signal power variation relationship under single-channel and multi-channel input conditions. Among them, the common amplifier is the amplifier without the ring cavity. In the experiment, only 1546.92nm signal light is considered, because its power is the strongest in the output spectrum of the highly stable multi-wavelength laser source, and it can be output from the even-numbered end of the wavelength interleaver. In traditional amplifiers, the relationship between gain and input signal power is basically the same under single-wavelength and multi-wavelength input conditions, that is, the gain attenuates with the increase of input signal power, and the gain of 1546.920nm wavelength decreases by about 3dB when the input channel increases. Therefore, the traditional EDFA obviously cannot meet the requir...

Embodiment 3

[0023] The experiment also shows the relationship between the gain and noise figure of the 1546.92nm signal light and the change of the input signal power under different cavity losses. Ordinary EDFA (can be regarded as a gain-clamped EDFA whose cavity loss is infinite) has a gain and noise figure of 28dB and 6.4dB respectively under small-signal input conditions. They both decay as the input signal power increases. In the gain-clamped EDFA, when the cavity loss is 24dB and 18dB, the input signal power is in the range of -32dBm to -10dBm, and the gain is locked to 17.8dB and 14dB respectively. Both the gain and the size of the dynamic gain-clamping region (the region where the gain remains stable as the input power varies) vary with cavity loss. As the cavity loss decreases, the gain becomes smaller and the dynamic gain clamping region becomes longer. When the cavity loss is infinite, 24dB and 18dB, the noise figures are 6.4dB, 5.8dB and 4.2dB respectively. The reason why t...

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Abstract

The present invention relates to optical communication. In the Er-doped fiber amplifier, the signal light provided by the tunable laser is output to the input end of the 90:10 optical coupler, the 90% output end of the 90:10 optical coupler is connected to the isolator, the other end of the isolator is connected to the 1550 port of 1550 / 980 nm wavelength selecting coupler, the 980 port is connected to 980 nm pumped laser; one end of the wavelength interleaving multiplexer, the Er-doped fiber, the isolator, the input of the wavelength interleaving multiplexer are connected successively; the wavelength interleaving multiplexer has its even number outputs connected to spectral analyzer and odd number outputs connected to the second input of the 90:10 optical coupler via a variable attenuator so as to one closed ring cavity. The amplified signal light may be output without containing laser and has low noise index, and the amplifier may be used in different WDM system.

Description

technical field [0001] The invention relates to an erbium-doped fiber amplifier, in particular to a low-noise index gain-clamped erbium-doped fiber amplifier, which belongs to the field of optical communication. Background technique [0002] With the rapid development of optical communication, people pay more and more attention to the application of optical fiber amplifier in backbone optical network and metropolitan area network system. Especially the erbium-doped fiber amplifier (EDFA) has played a milestone role in the development of Dense Wavelength Division Multiplexing (DWDM) system. For Erbium-doped fiber amplifiers used in DWDM systems, gain clamping, or gain equalization, is an important feature, which ensures that the amplification performance of Erbium-doped fiber amplifiers does not depend on the input signal power and the number of channels in the system. There are many solutions to solve the problem of gain clamping in ordinary erbium-doped fiber amplifiers. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/39
Inventor 詹黎义理林
Owner SHANGHAI JIAO TONG UNIV
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