High power and compact switchable bismuth based multiwavelength fiber laser

Abstract

A compact switchable multiwavelength fibre laser (SWFL) is proposed and demonstrated using a bismuth based erbium doped fibre amplifier (Bi-EDFA) and a Sagnac loop mirror (SLM) in a ring cavity. The proposed compact SWFL can generate up to 6 switchable wavelengths with an average peak power of 11 dBm and also shows good stability over time with a high side mode signal ratio (SMSR) of 40 dB that negates minor fluctuations in the laser output. The Bi-EDF based gain medium gives the SWFL a large usable bandwidth of up to 80 nm, and it is expected that this will allow the SWFL to be used as a tunable laser source for high power applications to meet increasing demand.

Mechanism of Subordinate Peak Skewing of FBG Sensor during Cracks Propagation Monitoring on Aluminum Alloy Structure

“…In fact, the distribution of strain patterns along the grating corresponds to crack propagation. Regarding crack propagation, the spectrum bandwidth and full width at half maximum (FWHM) [21] broadened, accompanied by a sudden broadening of the spectrum that occurs at a 5.4 mm crack length, in comparison with curve A in Figure 5(a). Meanwhile, the bandwidth of FWHM broadens from 0.3 nm to 0.4 nm, and the FWHM increases from 0.3 nm to 0.7 nm, with the crack propagating in Zone A.…”

Efficient 1.54μm laser property in near- stoichiometric Er:LiNbO3 crystal

“…The eye-safe 1.54 μm laser emission, assigned to the 4 I 13/2 -4 I 15/2 transition of Er 3 þ ion, matches well the operating wavelength ranges of dense wavelength division multiplexing (DWDM) systems, such as Conventional (C-) band (1530-1565 nm), Long Wavelength (L-) band (1565-1625 nm) and even Short Wavelength (S-) band (1480-1530 nm) [10][11][12][13]. Therefore, Er:LiNbO 3 crystal has become important building blocks for EDWAs [14].…”

Multiwavelength Brillouin erbium fiber laser in virtual linear cavity

“…The large number of Brillouin Stokes lines can be achieved at the peak gain of the erbium doped fiber (EDF). However, in convenient setups [11] the number of Brillouin Stokes (BS) lines is reduced as the Brillouin pump (BP) wavelength is tuned away from the EDF Peak gain due to occurrence of the selflasing cavity modes in the BEFL output spectrum [3]. Therefore, the tuning range of the MW-BEFL is determined by tuning Brillouin pump wavelength away from the EDF peak gain with free running laser absent.…”

“…Several approaches have been demonstrated to obtained multiwavelength from single laser source [1][2][3][4]. The nonlinearity phenomena in a fiber have been suggested by Cowle and Stepanov [5] as one of the various techniques to obtain multiwavelength laser by combining the nonlinear Brillouin gain medium and linear Erbium doped fiber gain.…”