利用半导体光放大器和滤波器组合实现高速波长转换和码型转换

将半导体光放大器(SOA)和滤波器组合使用是实现高速全光信号处理的有效途径。利用半导体光放大器和带宽为0.32nm的可调窄带滤波器同时实现了40Gbit/s的非归零(NRZ)信号的反相波长转换(WC)和非归零到伪归零(PRZ)信号的码型转换,波长转换和码型转换的结果差异取决于滤波器中心波长相对于探测光波长的失谐量。当滤波器的失谐量为-0.24nm时,输出反相的波长转换,此时滤波器起到加速半导体光放大器增益恢复的功能。当滤波器失谐量为 0.41nm和-0.48nm时,得到非归零到伪归零的码型转换,并且产生的伪归零脉冲分别出现在非归零信号的上升沿和下降沿,此时滤波器的作用是将探测光的相位信息转换为强度信息,并且该码型转换结果兼有波长转换的功能。

High Speed Wavelength Conversion and Format Conversion Based on Semiconductor Optical Amplifier and Optical Filter

It is a promising approach to achieving high-speed all-optical signal processing based on the combination of semiconductor optical amplifier (SOA) and optical bandpass filter (OBF). The inverted wavelength conversion (WC) of the nonreturn to zero (NRZ) and the format conversion from NRZ to pseudo return to zero (PRZ) are demonstrated synchronously based on single SOA and an optical bandpass filter with 0.32 nm bandwidth. The conversion results depend on the OBF detuning as respect to the probe carrier. When the OBF detuning is -0.24 nm, the output will be the inverted WC and the filter is used to accelerate the SOA gain recovery. When the detuning is 0.41 and -0.48 nm, the output result will be the NRZ to PRZ format conversion and the generated PRZ pulses appear at the leading edge and trailing edge of the NRZ signal respectively. The filter completes phase modulation to intensity modulation conversion. The converted PRZ signal realizes wavelength conversion as well.