Microwave photonic bandpass filter based on multi-wavelength fiber lasers and cascaded dispersion devices

A microwave photonic band-pass filter based on multi-wavelength laser and cascaded dispersion devices is proposed. To achieve the reconfigurable of the filter, a birefringence fiber loop mirror is used to shape the output signal of multi-wavelength laser shaping. The shaped signal is selected as the filter tap. The frequency selectivity of the filter is achieved by a delay unit which is the concatenation of standard single-mode fiber (SSMF) and fiber delay loop mirror. The tunability of the filter can be realized by changing the wavelength interval of the source or the length of the standard SSMF. The results show that the quality factor of the proposed microwave photonic filter increases by 182.26 and 3 dB bandwidth decreases by 670 MHz, compared to the filter only with SSMF as delay units.