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Measurement of the Free Spectral Range and the Side-Modes Suppression Ratio of a 9.3-GHz Single-Loop Opto-Electronic Oscillator by Fiber Path Selector

This paper describes measurements of the spurious modes of oscillation for a single-loop opto-electronic oscillator (OEO) at 9.3 GHz. The side modes of an OEO damage the oscillator's good spectral properties and therefore the behaviors of those unwanted modes need to be understandable in order to suppress them. Moreover, we review the state-of-the-art techniques for overcoming the side modes and suggest our measurement setup for effective testing of electrical bandpass filters.