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We demonstrate a 40-GHz dual-wavelength pulse source in S-and L-band on the basis of harmonically mode-locked fiber optical parametric oscillator. Through leveraging, a 150-m highly-nonlinear dispersion-shifted fiber with a positive β(4), good quality, and low timing jitter pulse trains in both S- and L-band can be generated simultaneously. Its tuning range is as wide as 71 nm, from 1507 to 1542 nm and from 1570 to 1606 nm, with a wavelength span of ~100 nm. The proposed scheme has the potential to become an efficient high repetition rate pulse source for optical communication beyond conventional wavelength band.

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 .

We demonstrate a Fourier domain mode-locked laser based on lanthanum-codoped bismuth-based erbium-doped fiber (Bi-EDF) for swept source optical coherence tomography (SS-OCT) imaging. Raman amplification is incorporated to suppress the gain competition and homogenous linewidth broadening effects of Bi-EDF. A wavelength sweeping bandwidth of 81 nm is generated under stable operation. Therefore, in vivo OCT imaging of human finger print and orange slices is enabled and the results are also presented. This scheme paves the way for doped fiber amplifiers to be employed to generate ultra-wideband SSs for OCT applications.

We demonstrate a 10-GHz multiwavelength pulsed generator based on a fiber optical parametric oscillator. By introducing two separated intracavity branches, simultaneous mode-locking at two different wavelengths in the L-band is achieved. Due to the parametric process between the pump and the two mode-locked signals, two idlers are generated in the S-band. Hence, simultaneous generation of a 10-GHz pulse train at four different wavelengths located in both the S- and L-band is accomplished. The wavelength of the generated pulse trains can be tuned over 54 nm, with the wavelength span from 1500 to 1617 nm. The stability of the proposed scheme is also experimentally investigated.