Multiple wavelength ultra continuous light sources

A dense wavelength division multiplexing, supercontinuous light source technology, applied in the field of optical communication, can solve the problem of non-return-to-zero code system, etc., and achieve the effects of good frequency stability, wavelength frequency stability, and wavelength stability.

Inactive Publication Date: 2004-10-27
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, the finally obtained multi-wavelength light source is only suitable for the return-to-zero code system, and cannot be used in the vast non-return-to-zero code system, and it needs to inject a large optical power into the optical fiber, generally above the watt level

Method used

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  • Multiple wavelength ultra continuous light sources

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Embodiment 1

[0017] As a multi-wavelength super-continuum light source used in DWDM systems, the conversion efficiency of four-wave mixing is required to be high, and the spectrum broadening of each channel should be small. Due to the phase shift caused by self-phase modulation and cross-phase modulation, the phase of the pulse will change when it propagates in the fiber. The phase matching condition of four-wave mixing should be adjusted according to the change of the pulse phase, and the parameters should be adjusted correctly in the actual implementation. In order to make the output spectrum wider and flatter, it is necessary to have strict requirements on the wavelength of the incident light. The optimal wavelength point under different pump light powers can meet the phase matching conditions of four-wave mixing, thereby producing the maximum Gain, this gain increases as the incident power increases. Similarly, the broadening of the pulse spectrum caused by self-phase modulation and cross-...

Embodiment 2

[0019]In order to see the propagation spectrum of the pulse in the optical fiber more clearly, we observed the frequency spectrum of the input pulse at 0, 5, 10, and 15km respectively. In the experiment, you can clearly see the spreading behavior of the pulse when it is affected by SPM and XPM in the fiber. As the distance increases, the spectrum of the pulse is more expanded, and the greater the input power, the greater the nonlinearity of the pulse. The more the spectrum broadens. When the input power is 50mw, the pulse still maintains the shape of a single pulse after 15km, and the amplitude does not drop much. After the power is increased, although the efficiency of four-wave mixing is improved, the pulse undergoes self-phase modulation and crossover The influence of phase modulation is more, and the spectrum is spread more. In Example 2, when the input power reaches 200mW, the fiber length is 5km, and the pump wavelength is 1559.1nm, the measured spectral width at the output ...

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Abstract

The multiple wavelength ultra continuous light source of dense wavelength division multiplexing belongs to optical communication area. Two fiber-coupler forms loop type cavity. Continuous light output from semiconductor laser through connection of 50:50 fiber coupler is input to phase modulator. Connection sequence is as following: from radio frequency microwave source to phase modulator, dispersed fiber, powerful erbium doping amplifier, dispersion displacement optical fiber, 90:10 fiber coupler. 90% output port is connected to another input port of 50:50 fiber couplers. 10% port is connected to one end of erbium doping fiber amplifier, and another end of the erbium doping fiber amplifier is input to demultiplexer. The invention through modulation generates stable shorter light wavelength with lower injected optical power.

Description

Technical field [0001] The invention relates to a transmitting light source for optical communication, in particular to a multi-wavelength dense wavelength division multiplexing optical communication light source based on super-continuous light generated in an optical fiber. It belongs to the field of optical communications. Background technique [0002] At present, the most used light source in dense wavelength division multiplexing systems is still distributed feedback semiconductor lasers with different wavelength separations. The number of semiconductor lasers increases synchronously with the number of channels. A higher single-channel rate uses optical time division multiplexing (OTDM) technology. Combined with DWDM, the transmission capacity of the system can break through terabits. The multi-wavelength light source of the dense wavelength division multiplexing system should have the characteristics of wide spectral range, narrow channel line width and highly stable channel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/00H04J14/02
Inventor 詹黎叶庆好夏宇兴
Owner SHANGHAI JIAO TONG UNIV
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