Multiwavelength Fiber Laser based on Bidirectional Lyot Filter in Conjunction with Intensity Dependent Loss Mechanism

Abstract

<span>We experimentally demonstrate a multiwavelength fiber laser (MWFL) based on bidirectional Lyot filter. A semiconductor optical amplifier (SOA) is used as the gain medium, while its combination with polarization controllers (PCs) and polarization beam combiner (PBC) induces intensity dependent loss (IDL) mechanism. The IDL mechanism acts as an intensity equalizer to flatten the multiwavelength spectrum, which can be obtained at a certain polarization state. Using different ratio of optical splitter has affected to multiwavelength flatness degradation. Subsequently, when we removed a polarizer in the setup, the extinction ratio (ER) is decreased. Ultimately, with two segments of polarization maintaining fiber (PMF), two channel spacings can be achieved due to splicing shift of 0° and 90°.</span>

Stable Triple-Wavelength Random Fiber Laser Based on Fiber Bragg Gratings

“…It has the ability to suppress mode competition from the EDFA and generate flat and stable lasing lines [41]. Alongside that, the combination of SOA, PBS, and PC2 promotes an intensity-dependent loss (IDL) mechanism from the NPR effect [42]. The IDL is a phenomenon associated with the attenuation of the signal that is dependent on light intensity [15,[42][43][44].…”

Investigation of Multiwavelength Performance based on different SOAs

“…Besides that, SOA has a simpler setup than EDFA since it does not require optical pumping. Based on SOA's advantage, there is an increasing number of studies on the generation of multiwavelength SOA fiber lasers with different comb filters [10,[13][14][15].…”

Performance Investigation of Dual Wavelength Fiber Laser using different SOAs

“…The main benefit of using SOA in MWFL is that it has the property of inhomogeneous gain broadening to alleviate the issue of mode competition that is commonly present in the generation of multiple lasing wavelengths at room temperature [10][11][12][13]. Low mode competition in SOA is a significant advantage over erbium-doped fiber amplifiers (EDFAs), where the number of laser modes is generally limited because of high mode competition resulting from the homogenous gain broadening of erbium ions.…”