Multi-wavelength switchable random fibre laser based on double Sagnac-loop filter

Pan, Honggang; Guo, Taotao; Zhang, Ailing; Liu, Chang

doi:10.1080/09500340.2021.1961906

Cited by 16 publications

(5 citation statements)

References 23 publications

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“…In Ref. 22, three different channel intervals can be obtained by adjusting two PCs, but the operation is difficult. In these filters, the switching of channel intervals is mainly achieved by series or parallel multiple PMFs.…”

Section: Experimental Setup Of the Proposed Rdfbflmentioning

confidence: 99%

“…21 At the same time, Pan et al also designed a switchable random laser based on a double Sagnac ring, which realized tunable laser output of single, double, three, and four laser channels, and the wavelength interval can be switched between 2.5 nm, 5 nm and 7.5 nm. 22 In the Sagnac loop and Lyot filter mentioned above, the main method of switching wavelength intervals is to use multiple polarization maintaining fibers (PMF) with different parameters to generate different wavelength-dependent phase differences.…”

Section: Introductionmentioning

confidence: 99%

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Tunable and switchable multi-wavelength random fiber laser based on random distributed feedback and improved Lyot filter

Qi,

Zhou,

Zhang

et al. 2024

Opt. Eng.

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A tunable and switchable multi-wavelength random fiber laser (MW-RFL) is proposed and experimentally demonstrated in this work, which consists of a random distributed feedback mechanism, an improved Lyot filter, and a nonlinear optical loop mirror (NOLM). The theoretical derivation and simulation analysis of the improved Lyot filter are carried out by using the transfer matrix theory. The results show that by adjusting the polarization controller (PC) in the filter, not only the channel interval can be switched between 0.9 and 0.45 nm, but also the extinction ratio (ER) of the transmission spectrum can be adjusted and the wave peak position can be moved. The feedback mechanism of the proposed laser is provided by the randomly distributed backward Rayleigh scattering generated in the single-mode fiber. By changing the pump laser power, the number of output laser channels will be linearly increased. When the channel interval is kept constant, the wavelength can be tuned within a certain range by carefully adjusting the PC3 in the NOLM. When the channel interval of the spectrum is 0.9 nm, the wavelength tuning ranges of the three and four laser channels are 3.6 and 3.5 nm, respectively. When the channel interval of the spectrum is 0.45 nm, the wavelength tuning ranges of the three and four laser channels are 2.8 and 2.77 nm, respectively. Then the variations of the output spectrum when using 25 km single-mode fiber (SMF) are studied. It is observed that the linewidth and side mode suppression ratio (SMSR) of the laser channel are significantly increased. Finally, the stability of the random laser is discussed, and the maximum central wavelength drift and peak power fluctuation measured at room temperature are 0.05 nm and 0.34 dB, respectively. The average peak power and SMSR are maintained at −4.47 dBm and 34.6 dB, respectively, which confirms that the laser has good stability.

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Section: Experimental Setup Of the Proposed Rdfbflmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable and switchable multi-wavelength random fiber laser based on random distributed feedback and improved Lyot filter

Qi,

Zhou,

Zhang

et al. 2024

Opt. Eng.

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“…In the experiment, a 2 m long PMF (PM1017-c 1550 FC/APC) and a 50:50 OC are selected to form a loop structure. Compared with the traditional Sagnac loop [22], the insertion loss is reduced to the greatest extent by shortening the length of the single-mode fiber connecting the PMF and OC. Figure 1(b) shows the schematic model of the improved Sagnac-like loop model.…”

Section: Principle and Characteristics Of The Sagnac-like Loop Embedd...mentioning

confidence: 99%

A C-band widely tunable and switchable erbium-doped fiber laser based on a Sagnac-like loop embedded in Lyot filter

Zhou¹,

Tong²,

Zhang³

et al. 2023

Laser Phys.

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In this paper, a new type of widely tunable and switchable multi-wavelength erbium-doped fiber laser based on a Sagnac-like loop embedded in Lyot filter is proposed. The nonlinear polarization rotation effect is obtained by adjusting two polarization controllers (PCs). The polarization-dependent isolator and the Sagnac-like loop are used as the basic structure to realize the wide tuning and wavelength switching in C-band. Compared with the traditional Lyot filter, the Sagnac-like loop is used to replace the segment of polarization-maintaining fiber, and a more uniform comb spectrum can be obtained by this filter. The tunable and switchable wavelengths can be achieved by adjusting the PCs based on the nonlinear effect of the loop. The laser can emit single-, dual-, triple-, quad- and quintuple-wavelengths. The optical signal-to-noise ratios all exceed 43 dB. It can also be adjusted to partial wavelength intervals for quad-wavelength and quintuple-wavelength. The tuning range can reach the full range of the C-band, and the laser efficiency can reach the practical application standard. It can be applied to some precision instruments and equipment.

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“…The generation of multiwavelength random fiber lasers (MWRFLs) relies not only on the gain medium, but also on the essential function of a comb filter. The comb filters that are usually used in MWRFL are the Sagnac loop mirror [23,24], Fabry-Perot filter [25][26][27], Lyot filter [28], and Mach Zehnder interferometer [29]. A few works of MWRFL have been published using fiber Bragg gratings (FBGs) as the comb filter, making it one of the most preferred comb filters among researchers [14,26,30,31].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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We demonstrate a generation of three lasing wavelengths with the assistance of Rayleigh backscattering as the stabilizer of peak power variations. The proposed laser consists of a combination of the semiconductor optical amplifier (SOA) and erbium-doped fiber amplifier (EDFA) as the amplifying media. Three fiber Bragg gratings are employed as the selective wavelength selectors at 1544, 15747 and 1550 nm. At 110 mA SOA current and 18 dBm EDFA output power, a flattened output spectrum with 0.9 dB peak power variation is attained. In terms of stability, the maximum peak power fluctuation for the individual laser is 0.24 dB within a 120 min observation period. Without the Rayleigh backscattering effect, the peak power flatness is severely degraded. This shows that the weakly distributed photons can be utilized as peak power stabilizers in fiber laser systems.

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Multi-wavelength switchable random fibre laser based on double Sagnac-loop filter

Cited by 16 publications

References 23 publications

Tunable and switchable multi-wavelength random fiber laser based on random distributed feedback and improved Lyot filter

Tunable and switchable multi-wavelength random fiber laser based on random distributed feedback and improved Lyot filter

A C-band widely tunable and switchable erbium-doped fiber laser based on a Sagnac-like loop embedded in Lyot filter

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

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