Frequency-Agile Electro-Optic Comb with Suppressed Phase Noise
In this paper,we report on a single-modulator electro-optic frequency comb whose repetition frequency can be modulated at high speed with a modulation rate of 1 MHz.With spectral broadening in a nonlinear fiber,a comb spectrum spanning 1.25 THz(10 nm,the central wavelength is 1550 nm)with 4800 narrow-linewidth combs separated by 260 MHz is achieved.The optical comb pulse width is compressed to 260 fs by dispersion compensation in a single-mode fiber.Also,the impacts of optical fiber amplification and nonlinear spectral broadening on the comb coherence are studied,and the common-mode phase noise of the comb is suppressed by a feedforward method based on the acousto-optic modulator.The developed electro-optic comb has promising applications for molecular spectroscopy and interferometric ranging.
electro-optic modulationoptical frequency combphase noisefrequency modulation
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