Quad-Wavelength Fiber Optical Parametric Oscillator With Equally Distributed Dispersion

We demonstrate a 10-GHz quad-wavelength pulse source based on fiber optical parametric oscillator with equally distributed dispersion. By adopting two spools of single-mode fiber inside the cavity with nearly the same dispersion, simultaneous mode-locking at two different wavelengths with the wavelength spacing of around ~ 1.9 nm in the L-band is achieved. Owing to the parametric process between the pump and the two mode-locked signals, two idlers are generated in the S-band with the same wavelength spacing. Hence, simultaneous generation of 10-GHz pulse train at four different wavelengths located in both S-and L-band is obtained. The wavelength of the generated pulse trains can be tuned over 67 nm, from 1504 to 1536 nm and from 1575 to 1610 nm, with the wavelength span of around ~ 106 nm .