A reconfigurable multiwavelength fiber laser with switchable wavelength channels and tunable wavelength spacing

Wavelength switching and tuning of fiber lasers by using a modifiable intra-cavity filter based on a modal Michelson interferometer

“…Nevertheless, most of the reported comb filters have a fixed construction, which is a disadvantage for generation of a reshaping of simultaneous resonances in the laser cavity, since the resonances are fixed just as the comb filter spectrum. On the other side, several modifiable comb filters have been reported in some works to reshape the laser output by adjusting the number of emission lines in a laser fiber, for instance, the adjustment of line emission number in optical fiber lasers had been based on a length cavity filter control [21], a thermally-induced linearly chirped fiber Bragg grating [22], a comb filter based on a first-order polarization mode dispersion emulator [23], and a transmission grating filter cascaded with programmable filter [24]. However, these laser configurations need equipment which controls the combfilter spectrum, increasing the complexity and the cost of the laser system.…”

Reconfiguration of the multiwavelength operation of optical fiber ring lasers by the modifiable intra-cavity induced losses of an in-fiber tip probe modal Michelson interferometer

“…Approaches for modifying comb filter spectra to construct reconfigurable multiwavelength lasers have been reported, for instance Liu et al [25], Shilong Pan et al [26], and Jia Li et al [27], where they reported switchable wavelength channels and tunable wavelength spacing by thermally induced linearly chirped fiber Bragg grating, a comb filter based on a first-order polarization mode dispersion emulator, and a transmission grating filter cascaded with programmable filters, respectively. However, the need to have extra equipment to control the comb filter wavelength-dependent losses, such as thermal sources, emulators, and programmable filters, is intrinsic for the functioning of these reconfigurable multiwavelength lasers, which is a disadvantage with regard to the cost and simplicity of laser construction.…”

Optical frequency generation based on active nonlinear conversion processes in Cr3+:LiCAF – PPSLT lasers

“…En la actualidad, la posibilidad de realizar procesos de conversión de banda ancha o de componentes espectrales discretas de forma simultánea resulta de especial interés tanto en aplicaciones de redes de comunicaciones basadas en la tecnología WDM (wavelength division multiplexing) [1] como en técnicas de tomografía de coherencia óptica (Optical Coherence Tomography, OCT), cuya resolución está estrechamente relacionada con el ancho espectral de las fuentes empleadas [2]. Para tales cometidos, resulta interesante desarrollar nuevas opciones tecnológicas que complementen a las existentes, basadas fundamentalmente en fuentes ópticas de banda ancha compuestas por dispositivos LED superluminiscentes o por fibras dopadas con tierras raras [10,11], así como de múltiple emisión de longitud de onda reconfigurabe [12,13]. En este trabajo se presenta y demuestra la conversión activa de múltiples de longitudes de onda (canales) y de fuentes ópticas de banda ancha en régimen de onda continua (CW), mediante procesos intracavidad de generación de diferencia de frecuencias de paso único en la región espectral comprendida entre 1500-1700 nm.…”