Fluctuations in Brillouin shifts and acoustic-phonon speeds in multiwavelength Brillouin Raman erbium-doped fiber laser generation

Abstract

Brillouin-shift (B-S) fluctuations in multiwavelength Brillouin Raman erbium-doped fiber laser generation are investigated to obtain a probability distribution of acoustic-phonon speeds in the crystal lattice of a dispersion-compensating fiber (DCF) in a linear cavity. Even though the available B-S line spacing can be at 0.076 and 0.08 nm when Raman pump (RP) power is zero or 76 mW, the other B-S possibilities are obvious, especially at RP power 257 mW. A crystal effective mass participating in the crystal vibration is obtained 8937, 8943, 8954, and 12,106 times the electron rest mass by fitting a general form of a Boltzmann density function and the resulting most probable speed of 5445 m/s at a fixed Brillouin pump power of 6.5 dBm and RP powers of 0, 76, 163, and 257 mW, respectively. Finally, an uncertainty in the crystal dimension is also estimated by Heisenberg’s uncertainty principle.

A kind of multiwavelength erbium-doped fiber laser based on Lyot filter

“…In recent years, erbium-doped fiber lasers (EDFLs) have attracted significant attention in the field of optical fiber lasers [1] and have been widely used in infrared detection, optical radar, and dense wavelength division multiplexer (DWDM). [2,3] In the EDFL research field, mode-lock lasers, [4] tunable wavelength lasers, [5] Raman lasers, [6] and singlefrequency [7] lasers are important research interests owing to their different applications. Multiwavelength tunable EDFLs have many advantages such as a large laser number, narrow linewidth, high stability, wide tunable laser wavelength, and high optical signal-to-noise ratio (SNR), [8,9] thus, they have been studied by many scientific research institutions.…”