In this paper, a low-cost repeaterless transmission system is demonstrated at 10Gbit/s using two Sampled Chirped fiber Bragg gratings (SCBG) to realize the dispersion compensation of 210km transmission over G.652 single-mode fiber (SSMF). The two SCBGs are used as dispersion management components to mitigate the damage caused by the pulse broadening effort before the receiver terminal. Non-return-to-zero (NRZ) modulation format is adopted and EDFAs as boost amplifier and pre-amplifiers in this system. Low-gain Raman amplifier is used to improve the signal noise ratio (SNR) at the end of the transmission fiber.
In this paper, with the superimposed technique a 4-channel chirped grating in a fiber for multi-channel dispersion compensation is been written. We have performed a dispersion compensation experiment with a system using a 10Gbit/s externally modulated laser. The experimental results show that measured BER of the all channels has the power penalty less than ±0.3dB when the grating is inserted through a circulator in front of the 100km transmission fiber.
A novel method to suppress the waveform distortion and compress frequency chirp in SOAs as in-line amplifiers in WDM networks is proposed and experimented. The results show that the signal distortion and pattern effect are reduced significantly and over 5dB expansion of input dynamic range is achieved.
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<SUP>-10</SUP>).