Longitudinal Modes in Random Feedback Fiber Lasers

Tovar, Pedro; Ynoquio, H. Luis; Temporão, Guilherme P.; Weid, J. P. von der

doi:10.1364/cleo_si.2019.sm1l.6

Cited by 3 publications

(6 citation statements)

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“…In both works, two gain media were employed to compensate for the large loss and amplify the weak RBS feedback in the ring cavity. P. Tovar et al demonstrated that single-mode operation dominated when the SOA input current was close to the threshold value and increasing the SOA current resulted in multimode operation [18]. A hybrid configuration of gain media has been explored, aiming for new sensing applications, lower noise, and higher RFL efficiency [5].…”

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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“…The main objective of this work is to advance in the comprehension of the fundamental physics governing the chaotic emission of random DFB fiber lasers. By using a novel experimental setup with point-based gain provided by an SOA [12,13] instead of the commonly used distributed gains, i.e., Raman gain [1,10,14,15], Brillouin gain [16][17][18][19] and fiber-doped amplifiers [20][21][22], gain and feedback are decoupled, allowing us to focus on the gain and feedback effects separately. This simplifies significantly the analysis of the key aspects of random DFB fiber lasers, as for instance complex cooperative effects between Brillouin gain and Rayleigh feedback [23] are not present.…”

Section: Objectivesmentioning

confidence: 99%

“…As mentioned before, the mirrors reflectivity and attenuation along the cavity medium shall be considered in the expression of |r|. The overall loss coefficient α r and the attenuation coefficient are related by [33] |r| 2 = exp(−2α r d), (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) where…”

Section: Optical Resonatormentioning

confidence: 99%

“…After the first random DFB fiber laser was proposed with distributed Raman gain, different gain mechanisms were employed to verify random laser action. Indeed, multiple works report the generation of random lasers with different gain mechanisms [12,13,18,22,[87][88][89][90][91][92][93][94][95][96][97][98][99]. SBS is one of the alternatives to provide gain for random laser action.…”

Section: Other Gain Mechanismsmentioning

confidence: 99%

“…Several works reported on the usage of SOA-based random DFB fiber lasers [12,13,[96][97][98][99]. Although the mode structure was not discussed in detail, single longitudinal mode (SLM) operation with narrow linewidth has been claimed [97][98][99].…”

Section: Other Gain Mechanismsmentioning

confidence: 99%

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The Role of Rayleigh Backscattering of Coherent Light in the Mode Dynamics of Random DFB Fiber Lasers

BRAGA¹

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I would like to thank my advisor Jean Pierre von der Weid, whose teaching capabilities go far beyond optics and photonics. I learned to be curious about every tiny detail, which not often, but occasionally, hides incredible answers, revealed only to those who persist in being curious.To all my colleagues and friends from the photonics laboratory at PUC-Rio, who were always there to help and happy to discuss about all the interesting phenomena we witnessed over the years.To my wife, who enlightens my days with joy and love, being the best life-partner any man could ask for.To my mother, for her unlimited love and support, and for encouraging me along each and every step of the way.To my brother. My uttermost example of integrity, who has always chosen the path made of principles, that leads to character.Without them, this work would not have been possible. To all my family and friends, who directly or indirectly contributed to this work.This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior -Brasil (CAPES) -Finance Code 001. And I would also like to thank the Brazilian agency CNPq for the financial support.

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