Optical Comb Generation in S-Band Region using a Brillouin Erbium Fiber Laser

There has been increased research effort in multi-channel laser sources, to meet the possible demand from wavelength multiplexed sensor/communication systems. Densely shifted wavelength spacing and stabilized/flattened peak powers between neighbor channels are two key performance parameters of real interest. A hybrid Brillouin/erbium fiber laser (BEFL) is one of the strong candidates for realizing multi-wavelength operation with equal channel spacing. It utilizes both the nonlinear Brillouin gain in the single-mode fiber (SMF) and linear gain in erbium-doped fiber (EDF) to generate multiple wavelength operation with channel spacing of approximately 11 GHz in the 1550 nm region. Most of the multi-wavelength BEFL systems are focused in conventional band (C-band) and long wavelength band (L-band) due to the bandwidth limitation of Erbium-doped fiber amplifier (EDFA), which has been demonstrated by various laboratory [1-3]. Recently, a new S-band amplification technique, which utilizes erbium doped silica fiber with depressed cladding design and 980nm pump laser to generate EDF gain extension effect, has been reported [4]. By using this S-band amplifier, the operating wavelengths of BEFL can be extended to S-band range. In thi