3 October 2005 Demonstration of a phase-modulator-based all-optical microwave mixing and filtering system for radio-over-fiber applications
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Abstract
In this paper an all-optical signal processor that performs both microwave mixing and bandpass filtering in a radio-over-fiber link is proposed and demonstrated. The frequency mixing is achieved by applying a local oscillator frequency and a BPSK modulated subcarrier to an electrooptic phase modulator. The mixed signals at the output of the electrooptic phase modulator are then fed to a single mode fiber link, which acts as a dispersive device for bandpass filtering and distributes the mixed signal to a remote site. The combination of the phase modulator, a multiwavelength laser source and the SMF link forms an all-optical microwave bandpass filter to suppress the levels of unwanted mixing products. A subcarrier frequency up-conversion from 3.25 GHz and 3.5 GHz to 11.7 GHz performed over a 25 km fiber link is experimentally demonstrated, in which BPSK modulation formats with data rates of 172 Mb/s and 344 Mb/s are applied. Eye diagrams are measured at the receiver end after demodulation, demonstrating a good up-conversion is achieved.
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Fei Zeng, Jianping Yao, "Demonstration of a phase-modulator-based all-optical microwave mixing and filtering system for radio-over-fiber applications", Proc. SPIE 5971, Photonic Applications in Nonlinear Optics, Nanophotonics, and Microwave Photonics, 59711Q (3 October 2005); doi: 10.1117/12.628361; https://doi.org/10.1117/12.628361
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