A 40Gb/s dynamic dispersion compensation system employing the tunable dispersion compensation device and the spectral shift in the semiconductor optical amplifier is demonstrated. The compensation accuracy can reach 5ps/nm, and the range is 400ps/nm.
The online dispersion monitoring technique based on XGM between the two sidebands of the optical signal in a semiconductor optical amplifier (SOA) is proposed in this paper. The simulation shows that through the cross gain modulation between the two sidebands of the signal and introducing dither to the time delay between them and extracting the 2nd order frequency component of the dither in the SOA output, the dispersion variation can be obtained and the dispersion monitoring range can be improved.
Optical trains with repetition rates as high as 10GHz~40GHz are obtained by using a novel high speed mode-locked fibre laser. It combines both active mode-locked effect and passive mode-locked effect so the FWHM of the output optical pulses can be decreased to 2ps. And the performance of the proposed fiber laser is analysed.
In this paper a novel online chromatic dispersion monitoring method employing the spectral shift in the semiconductor optical amplifier (SOA) is proposed and experimentally investigated. The power of the long wavelength side of the output signal through the SOA is extracted by a narrow bandwidth filter, and is utilized to measure the dispersion of the signal. The experiment shows that the ratio of the filtered power to the total power decreases 10 dB while the absolute value of the dispersion increases 700 ps/nm, with the input average power kept constant.
10Gb/s optical internet network (NSFCnet) in china with protection switching function and performance monitoring is introduced in this paper. 16x10Gb/s Transmission is demonstrated over 400km SMF with 3 network elements consisting of multiplxers and demultiplxers. The power penalties for all 16 channels are measured to be less than 2dB (BER=10-10).
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