All-optical code conversion method with wavelength conversion function

A wavelength conversion and conversion method technology, which is applied in optics, nonlinear optics, instruments, etc., can solve the problems of limiting the flexibility of code conversion technology and low efficiency of four-wave mixing effect, and achieves wide working wavelength range and high conversion efficiency. High, responsive effects

Inactive Publication Date: 2012-07-25
XIAN UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, the four-wave mixing effect in the semiconductor optical amplifier is inefficient, and the traditional high-dispersion-shift nonlinear fiber needs to set the pump ligh...

Method used

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  • All-optical code conversion method with wavelength conversion function
  • All-optical code conversion method with wavelength conversion function
  • All-optical code conversion method with wavelength conversion function

Examples

Experimental program
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Effect test

Embodiment 1

[0016] A code conversion method that can realize all-optical NRZ to RZ, and can complete the all-optical multicast function while code conversion, the specific principle is as follows figure 1 : The signal light carrying data information is generated by modulation of continuous light with a wavelength of λs, which is an NRZ code data stream, and the pump light is a narrow pulse width optical pulse sequence with a wavelength of λp, which can be regarded as a bit full "1" with a small duty ratio "RZ code, couple the two, and inject the high linear photonic crystal fiber after further power amplification. Because the dispersion of the photonic crystal fiber is flat, it can meet the phase matching condition in a wide wavelength range, and the obvious four-wave mixing effect occurs. Two beams of idler light are generated on both sides of the signal light and the pump light. Since the pump light is an ultrashort optical pulse with all "1" bits, it does not carry any information, and ...

Embodiment 2

[0020] Such as image 3 An example of realizing all-optical NRZ-to-RZ code conversion based on the four-wave mixing effect in a flat highly nonlinear photonic crystal fiber with dispersion. The wavelength-tunable continuous light source (Santec MLS-2100) emits continuous light with a wavelength of 1556.22nm , after the polarization controller PC1 is injected into the lithium niobate modulator, the function of the polarization controller PC1 is to ensure that the vibration direction of the incident light matches the main axis of the lithium niobate modulator, so as to achieve the best modulation effect, and the RF signal source sends out a 10GHz radio frequency signal (RF) drives the BER tester, and the pattern generator in the BER tester provides a byte length of 2 31-1. The rate is 10Gbit / s pseudo-random bit sequence (PRBS), and then drives the lithium niobate modulator to generate an NRZ optical signal with a repetition rate of 10Gbit / s. The pump light is an ultra-short pul...

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Abstract

The invention discloses an all-optical code conversion method with a wavelength conversion function, which is characterized in that an RF (radio frequency) signal source sends out a radio-frequency signal with 10GHz recurrence frequency to be injected into a mode-locked semiconductor laser for active mode locking, the mode-locked semiconductor laser sends out an ultra-short pulse sequence with 10GHz recurrence frequency as pump light, an erbium-doped optical fiber amplifier is used for power amplification of the pump light prior to that spontaneous radiation noise is filtered by a filter 1, the pump light passes through a PC (polarization controller) 2 to realize optical coupling with an NRZ (non-return-to-zero) signal to be converted, and a PC1 on an NRZ signal light branch is used for adjusting the polarization state of a light beam. After coupling of the pump light and the NRZ signal, the pump light and the NRZ signal are injected into an overhigh-power erbium-doped optical fiber amplifier for power amplification prior to entering a 50-meter photonic crystal fiber and generating four-wave frequency mixing effect in the photonic crystal fiber, and two narrow-band optical filters are used for respectively filtering sidebands, so that a code conversion signal is obtained while wavelength conversion is completed, and a wavelength multicast function is realized.

Description

technical field [0001] The invention relates to the technical field of all-optical network interfaces, in particular to an all-optical code conversion method with wavelength conversion function. Background technique [0002] With the continuous emergence of bandwidth-enhanced multimedia services such as video on demand and network medical services, people's demand for network bandwidth is increasing year by year. Wavelength division multiplexing (WDM) and time division multiplexing (OTDM) are the two most important types of Signal multiplexing, the former generally adopts the non-return-to-zero (NRZ) format, because it has tight channel wavelength spacing, high spectral efficiency, strong time jitter and dispersion tolerance, and is mainly used in metropolitan area networks and access networks. Network access, the latter generally adopts the return-to-zero code (RZ) format, because it has a small duty cycle, high polarization mode dispersion tolerance, good resistance to lin...

Claims

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Application Information

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IPC IPC(8): G02F1/35G02F1/365
Inventor 惠战强巩稼民
Owner XIAN UNIV OF POSTS & TELECOMM
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