All-optical non-conjugated wavelength multicasting of QPSK signal with capability of phase regeneration

作者：Lian Junzi; Fu Songnian^*; Meng Yan; Tang Ming; Shum Perry; Liu Deming

来源：Optics Express, 2014, 22(19): 22996-23006.

DOI：10.1364/OE.22.022996

We propose all-optical one-to-three non-conjugated wavelength multicasting of QPSK signal with capability of phase regeneration, using dual-conjugated-pump phase sensitive amplification (PSA). Based on the seven-wave model, we can obtain phase transfer functions of individual multicasting channel. Different from two multicasting copies, the phase regeneration performance of input signal is determined by the nonlinear phase shift. Moreover, the optimal squeezing points of three multicasting channels have a deviation. Thus, there exists a regeneration performance trade-off among three multicasting channels. Our numerical simulation shows that the error vector magnitude (EVM) of 50 Gb/s QPSK signal can be successfully improved when both nonlinear phase shift and four-state position in its constellation are optimized. The calculated BER curves verify that the OSNR penalties of three multicasting channels are improved by around 1dB at BER = 10(-3).

• 出版日期2014-9-22
• 单位华中科技大学; 南阳理工学院