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提出了一种相位调制平衡探测的方法,该方法采用相位调制器,将电信号调制到光波上,并通过布拉格光珊(FBG)将相位调制的信号转换成强度调制的信号,然后通过探测器平衡探测。该方法能够提高约10 dBm的信号功率,虽然此方法会引入约4 dBm的噪声,但引入的噪声远小于提高的信号功率。一般来说,无杂散动态范围SFDR是与输出信噪比SNR成比例的,即当SNR增加时,SFDR也会增加,因此整个系统的性能是提高的。最后通过Optisystem软件仿真验证这一方法的可行性。
A phase modulation balance detection method is proposed. The method uses a phase modulator to modulate the electrical signal onto a light wave and converts the phase-modulated signal into an intensity-modulated signal through a Bragg grating (FBG), and then passes through a detector Balance detection. This method can increase the signal power of about 10 dBm. Although this method introduces about 4 dBm of noise, the noise introduced is far less than the increased signal power. In general, spurious-free dynamic range SFDR is proportional to the output signal-to-noise ratio, SNR, which increases as SNR increases, so the overall system performance is improved. The feasibility of this method is verified by Optisystem software simulation.