Abstract
Multi-wavelength fiber lasers have emerged as a promising light source for the application in wavelength division multiplexing communication, terahertz wave generation and optical sensing due to high efficiency and robustness. Lyot-filter emerges as a potential device for multi-wavelength generation application. However, because of the high birefringence of polarization maintaining fiber in Lyot-filter, it is difficult to generate broadband dual-wavelength or multi-wavelength mode-locked fiber laser by using common Lyot-filter. In this paper, for the first time, we propose an idea of using the low birefringence induced by bending the single-mode fiber to form a Lyot-filter for dual-wavelength mode-locked fiber laser generation. The dual-wavelength output centers at 1532 and 1556 nm and it may simplify the set-up for dual-wavelength mode-locked laser.
Highlights
Multi-wavelength fiber lasers have emerged as a promising light source for the application in wavelength division multiplexing communication, terahertz wave generation and optical sensing due to high efficiency and robustness
For the first time, we propose an idea of using the low birefringence induced by bending the single-mode fiber to form a Lyot-filter for dual-wavelength mode-locked fiber laser generation
Dual-wavelength or multi-wavelength fiber lasers have the advantages of high efficiency, compact structure and robustness so that they have found applications in optical fiber sensing, laser comb generation, wavelength-division-multiplexed communication and terahertz wave generation [1]–[4]
Summary
Dual-wavelength or multi-wavelength fiber lasers have the advantages of high efficiency, compact structure and robustness so that they have found applications in optical fiber sensing, laser comb generation, wavelength-division-multiplexed communication and terahertz wave generation [1]–[4]. In order to generate multi-wavelength outputs in a mode-locking laser, many researchers combined a comb filter together with mode-locking techniques such as nonlinear polarization rotator (NPR), nonlinear optical loop mirror (NOLM) and nonlinear amplification loop mirror (NALM) [11]–[17]. One technique was proposed using a programmable attenuator to effectively control the saturation condition and the gain profile of the EDF in the laser cavity through intra-cavity loss tuning [18]. High quality stable dual-wavelength mode-locking is hard to be achieved. Among these techniques for dual-wavelength or multi-wavelength mode-locking, Lyot-filter (birefringence-induced spectral filter) is a common approach because of its compact structure and broadband operation property [19]–[21]. By appropriately adjusting the polarization controllers (PCs), singlewavelength mode-locked outputs center at either 1532 nm or 1556 nm can be selectively tuned
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