Stable and spacing-adjustable multiwavelength Raman fiber laser based on mixed- cascaded phosphosilicate fiber Raman linear cavity

Abstract

A novel multiwavelength Raman fiber laser based on the mixed-cascaded Stokes effects of phosphosilicate fiber is proposed and demonstrated experimentally. By using stimulated Raman scattering of both P(2)O(5) and SiO(2) along 1 km phosphosilicate fiber pumped with a 1064 nm double-clad fiber laser, the mixed-cascaded Raman linear cavity is formed by a pair of fiber Bragg gratings at 1239 nm, a polarization-maintaining fiber (PMF) Sagnac loop filter, and a conventional optical loop mirror. Up to 15-wavelength stable oscillations around 1320 nm are obtained with a wavelength spacing of 0.44 nm and power nonuniformity of less than 4 dB. By changing the length of the PMF in the Sagnac loop filter from 10 to 5.5 m, the wavelength spacing is adjustable from 0.44 to 0.8 nm. The extinction ratio of the laser is more than 30 dB. Excellent stability is also observed with a peak power fluctuation of less than 0.8 dB in 1 h.

Resilient long-distance sensor system using a multiwavelength Raman laser

“…The simultaneous four lasing channels show very good time stability although the whole experiment has been carried out without room temperature stabilization or vibration isolation systems [6,[22][23][24][25][26]. The maximum output power variation detected in the case of FBGs at room temperature was 1.3 dB.…”

Temporal characterization of a multi-wavelength Brillouin–erbium fiber laser

“…Multi-wavelength sources with a constant channel spacing that is in the order of tens of gigahertz are useful for many applications such as metrology [1], spectroscopy [2], arbitrary waveform generation [3], microwave synthesizers [4], wavelength division multiplexing (WDM) [5,6] and high-speed optical clocks [7] for optical communications. Among other techniques [8][9][10], Brillouin-based lasers have gained considerable attention due to their advantages such as their simplicity, robustness, and only need for standard components. Stimulated Brillouin scattering (SBS) is a third order coherent interaction between a pump wave, an acoustic wave and a redshifted Stokes wave [11].…”

Multiwavelength fiber laser employing a nonlinear Brillouin optical loop mirror: experimental and numerical studies

“…Multiwavelength fiber lasers (MWFLs) have aroused considerable interest due to their potential applications in optical fiber sensing, microwave photonics and dense wavelength division multiplexing (DWDM) systems over the past years. Various approaches and mechanisms have been proposed to obtain multiwavelength operation in a fiber laser, such as frequency-or phase-shifted feedback [1,2], four-wave mixing [3,4], nonlinear optical loop mirror (NOLM) [5][6][7][8], nonlinear polarization rotation [9,10], semiconductor optical amplifier [11,12], Raman amplifier [13,14] and stimulated Brillouin scattering (SBS) [15][16][17][18][19][20]. Among these approaches, the MWFLs based on SBS or NOLM are particularly attractive for their simple configuration, narrow linewidth (by utilizing SBS effect) and flat output amplitude (by utilizing NOLM effect).…”