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This paper reports a 400-km ultra-long haul unrepealed transmission system in a 8×10 Gbit/s optical transmission network (OTN) by using forward Raman amplifier and backward second order remotely optical pumped amplifier(ROPA). A second order ROPA is obtained by adding an auxiliary second order pump to the first order ROPA. Through experiment, we compare the performance of 1st ROPA and 2nd ROPA in...
The amplification characteristics of DPSK signal in semiconductor optical amplifier (SOA) is numerically simulated and experimentally demonstrated for the first time. The results show that the bit pattern effect (BPE) of the DPSK signal is induced by SOA. According to the results, when pulsewidth of the signal is comparable to the gain recovery time of SOA, the BPE is severe. And when the pulsewidth...
The amplification characteristics of DPSK signal in semiconductor optical amplifier (SOA) is numerically simulated and experimentally demonstrated for the first time. The results show that the bit pattern effect (BPE) of the DPSK signal is induced by SOA. According to the results, when pulsewidth of the signal is comparable to the gain recovery time of SOA, the BPE is severe. And when the pulsewidth...
We experimentally demonstrate, for the first time, a second-order few-mode distributed Raman amplifier with 4 dB mode-equalized gain. The noise figure improvement of the LPoi andLPn modes are respectively 1.2 dB and 1.1 dB compared with first-order Raman amplification scheme. We also use optical time-domain reflectometer (OTDR) to measure the signal evolutions, and the results confirm the low noise...
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