NRZ (Return-to-Zero, RZ) pulse occupies only part of the entire bit period, of higher polarization mode dispersion tolerance and non-linear resistance which is widely used in high-s" />
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All-Optical Format Conversion Based on Fiber Nonlinearities

Author: MengXiaoJun
Tutor: ZuoLianShan
School: Southwest Jiaotong University
Course: Signal and Information Processing
Keywords: Optical fiber communication All-optical data format conversion Cross-phase modulation Highly nonlinear optical fiber NRZ NRZ Split-step Fourier algorithm
CLC: TN929.11
Type: Master's thesis
Year: 2011
Downloads: 63
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Abstract


NRZ' dissertation">NRZ (Return-to-Zero, RZ) pulse occupies only part of the entire bit period, of higher polarization mode dispersion tolerance and non-linear resistance which is widely used in high-speed backbone network. And RZ code, (Non-Return-to-Zero, NRZ) the NRZ has high spectral efficiency, simple pattern and time jitter tolerance of the large, commonly used in low-rate access network . RZ and NRZ data format conversion from the need to be the backbone of high-speed and low-speed access network node. This paper focuses on cross-phase modulation-based highly nonlinear fiber (Highly Nonlinear Optical Fiber, HNLF) (Cross-Phase Modulation XPM) effect and offset filtering all-optical data format conversion program, the main contents include: ( 1) starting from the nonlinear Schrodinger equation, HNLF in the XPM effects and the offset filter to achieve a numerical model of the data format conversion program. Based on this model, discussed the different duty cycle chirped RZ signal, the chirped RZ signal converted NRZ code performance. The results showed that: after the conversion the NRZ code performance is affected by the duty cycle of the input RZ signal when the duty cycle of the RZ signal can be realized within the range of 30% -50% is preferably converted, simultaneous contrast chirp described chirped little effect on the conversion NRZ signal quality. In addition, the super-Gaussian type RZ to NRZ conversion also made a corresponding numerical simulation, different duty cycle RZ signal, the dispersion values ??of the two signals to do the converted NRZ Q value analysis given The Q-factor variation graph. (2) experimental realization rate for 10-Gbit / s, duty cycle of 33% of the RZ code to NRZ code conversion, compared to the original continuous probe light spectrum and broadening spectrum are given before and after conversion signal typical eye diagrams and bit error rate characteristics. The results show that the bit error rate of 10-9 RZ conversion to less than 1 dB power penalty introduced by the NRZ code. Indirectly verify the feasibility of the conversion program in a 160-Gbit / s or even higher speed optical fiber communication system. (3) the use of highly nonlinear optical fiber combined with filtering model, numerical simulation rate for 40-Gbit / s non-return-to-zero amplitude shift keying (On-Off Keying OOK) code to zero binary phase shift keying, four into the Built phase shift keying (Bit Phase-Shift Keying, Quartary Phase-Shift Keying, BPSK, QPSK) code conversion, and the polarization state change of the two signals converted RZ-BPSK phase.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications > Optical fiber communication
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