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An Optoelectronic Oscillator Based on Carrier-Suppression-Effect-Free Single Bandpass Microwave Photonic Filter

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3 Author(s)
Chenjun Liu ; Dept. of Electron. Eng., Shanghai Jiao Tong Univ., Shanghai, China ; Weiwen Zou ; Jianping Chen

A novel optoelectronic oscillator based on a single bandpass microwave photonic filter (MPF) without any electronic microwave filter is proposed and experimentally demonstrated. The MPF, which is composed by a broadband optical source, an inline interferometer based on a variable optical delay line (VODL), an intensity modulator, and a dispersive element, serves as an oscillating mode selector. The oscillation frequency can be tuned by changing the differential time delay via the VODL. Due to the non-carrier-suppression effect of the selector, the oscillator can generate transmission-null-free microwave signal with widely tunable frequency range. An experiment is performed, and a tunable frequency range of 6.8 GHz is achieved. The generated microwave signal at ~ 6.5 GHz ( ~ 1.06 GHz) exhibits a good phase noise performance about -95 dBc/Hz ( -110 dBc/Hz) at an offset of 10 kHz.

(a) The filter frequency response after EAP amplified. (b) The generated microwave signals from sim1 GHz to sim6.8 GHz. The resolution bandwidth (RBW) is 300 kHz and delta_{3, {rm dB}} = 15 hbox{nm}. Different colors in (a) or (b) correspond to different frequencies under different delay times (Delta tau). (c) The tuned filter center frequency (f_filter) and oscillated frequency (f_RF) with the delay of VODL when delta_{3, {rm dB}} = 5 hbox{nm} or 15 nm. (a) The filter frequency response after EAP amplified. (b) The generated microwave signals from sim1 GHz to sim6.8 GHz. The resolution bandwidth (RBW) is 300 kHz and delta_{3, {rm dB}} = 15 hbox{nm}. Different colors in (a) or (b) correspond to different frequencies under different delay times (Delta tau). (c) The tuned filter center frequency (f_filter) and oscillated frequency (f_RF) with the delay of VODL when delta_{3, {rm dB}} = 5 hbox{nm} or 15 nm.

Published in:

Photonics Journal, IEEE  (Volume:5 ,  Issue: 5 )