Photonic Microwave Multi-frequency Measurement and Signal Detection Based on Superimposed Chirped Fibre Bragg Gratings

A photonic approach to implement microwave multi-frequency measurement and signal detection based on superimposed chirped fibre Bragg grating (S-CFBG) is proposed. This receiver can measure microwave signal with multiple frequency components and detect baseband data information located at these frequency simultaneously without local radio frequency (RF) source array. An optical frequency comb (OFC) is generated by using the first S-CFBG. The input broadband RF signal is multi-cast by the OFC, spectrally sliced by the second S-CFBG and then separated by an optical demux. Multi-frequency signal with measurement range form 0 to 40 GHz and accuracy of 0.5 GHz is achieved. The bit error rate (BER) performance of the received non-return-to-zero (NRZ) signal, which was located at different microwave frequency, is researched.