Double Brillouin frequency spaced multiwavelength Brillouin-erbium fiber laser with 50 nm tuning range

Abstract

A 50 nm tuning range multiwavelength Brillouin-erbium fiber laser (MWBEFL) with double Brillouin frequency spacing is presented. Two separated gain blocks with symmetrical architecture, consisted by erbium doped fiber amplifiers (EDFAs) and Brillouin gain media, are used to generate double Brillouin frequency spacing. The wider tuning range is realized by eliminating the self lasing cavity modes existing in conventional MWBEFLs because of the absence of the physical mirrors at the ends of the linear cavity. The Brillouin pump (BP) is preamplified by the EDFA before entering the single mode fiber (SMF), which leads to the reduction of threshold power and the generation enhancement of Brillouin Stokes (BS) signals. Four channels with 0.176 nm spacing are achieved at 2 mW BP power and 280 mW 980 nm pump power which can be tuned from 1525 to 1575 nm.

A stable and uniform-amplitude multi-wavelength erbium-doped fiber laser based on nonlinear polarization rotation and a polarization-maintaining fiber loop mirror

“…To overcome this obstacle, different methods have been investigated to alleviate mode competition and realize multi-wavelength oscillations at room temperature in EDFLs, in addition to the straightforward method of cooling EDF in liquid nitrogen [1], which is impractical in many applications. These include the introduction of the polarization hole burning effect [2,3], frequency shifters [4], nonlinear effects such as four-wave mixing [5][6][7], independent gain media [8,9], stimulated Brillouin scattering or stimulated Raman scattering in the laser cavity [10][11][12][13][14][15], nonlinear optical loop mirrors (NOLM) [16][17][18][19] and nonlinear amplifying loop mirrors (NALM) [20,21]. Nonlinear polarization rotation (NPR) [22][23][24], which is used to suppress super-mode noise and to equalize the amplitude, can induce wavelength-dependent and intensitydependent loss (IDL) in generating multi-wavelength oscillations in EDFLs.…”

A widely tunable double-Brillouin-frequency spaced multiwavelength fiber laser with a 110 nm tuning range

“…A figureof-eight configuration which is formed by two couplers and a circulator was used to generate 0.16 nm line spacing through blocking the even-order Stokes signals and permitting the oscillating of odd-order Stokes signals [13]. A 50 nm tuning range MWBEFL with double-Brillouin-frequency spacing was demonstrated in [14]. The double-Brillouin-frequency spacing is achieved by separating the odd-order BS signals.…”

Investigation of Q-Switching Characteristics in Single- and Double-Spacing Multi-Wavelength Brillouin Erbium Fiber Laser

“…A BEFL with a quasi-periodic pulsation characteristic was reported based on a linear configuration with a single Brillouin spacing (BS) [12]. Recently, multi-wavelength BEFLs with double BS of around 0.16 nm have also been reported [14].…”