Abstract
we propose and demonstrate a bandpass microwave photonic filter (MPF) with ultrahigh stopband attenuation and skirt selectivity based on a simple signal cancellation technique. By injecting two phase modulated signals located on opposite sides of two resonant gain peaks of a Fabry-Pérot semiconductor optical amplifier (FP-SOA), two microwave frequency responses can be generated by the two input signals, respectively. The two frequency responses will add together within the passband but cancel each other out within the stopband, thus generating a MPF with simultaneous ultrahigh stopband attenuation and skirt selectivity. In the experiment the obtained MPF exhibits single passband in the range from 0 to 18 GHz and is tunable from 4 to 16 GHz by adjusting the laser wavelengths. During the tuning process the maximum stopband attenuation is 76.3 dB and the minimum 30-dB to 3-dB bandwidth shape factor is 3.5.
Highlights
Microwave photonic filter (MPF) is a promising substitute for the traditional pure electrical filter in modern signal processing systems benefiting from its intrinsic advantages of low loss, large bandwidth, wideband tunability, good reconfigurability and immunity to electromagnetic interference (EMI) [1,2,3]
In this paper we demonstrate a simple bandpass MPF with ultrahigh stopband attenuation and skirt selectivity based on an electro-optic phase modulator (EOPM) and a Fabry-Pérot semiconductor optical amplifier (FP-SOA)
The bias current of the FP-SOA is adjusted at 87.75 mA and the operating temperature is controlled at 25°C during the experiment
Summary
Microwave photonic filter (MPF) is a promising substitute for the traditional pure electrical filter in modern signal processing systems benefiting from its intrinsic advantages of low loss, large bandwidth, wideband tunability, good reconfigurability and immunity to electromagnetic interference (EMI) [1,2,3]. “Single passband microwave photonic filter with continuous wideband tunability based on electro-optic phase modulator and fabry-pérot semiconductor optical amplifier,” J.
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