Single-mode operation of a coiled multimode fiber amplifier

Koplow, Jeffrey P.; Kliner, Dahv A. V.; Goldberg, L.

doi:10.1364/ol.25.000442

Cited by 504 publications

(167 citation statements)

References 20 publications

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“…For example, at a core diameter of 25 m, the differential bend loss between the fundamental and modes was simulated to be 0.35 dB/m. The simplified formula, in contrast, predicts differential loss on the order of 5 dB/m [4].…”

Section: Discussionmentioning

confidence: 94%

“…and simplifying to first order then leads to an expression similar to (1), but in terms of the unperturbed index (4) This is the refractive index distribution pertaining to the equivalent, straight waveguide that was used for the BPM simulations By setting x just within the caustic boundary, error due to this perturbation was minimized.…”

Section: Bent Fiber Simulationmentioning

confidence: 99%

“…Other analytical bend loss formulae are similarly limited, in that none are known to reliably predict mode-dependent bend loss in multimode fibers. This has become a significant problem with the development of the coiled multimode fiber amplifier [4], which uses bend loss to strip out the higher order fiber modes, and thereby achieve single-mode, large mode area operation. Optimizing these devices, and understanding their ultimate limitations, requires that mode-dependent bend loss be predicted accurately.…”

Section: Introductionmentioning

confidence: 99%

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Improved Bend Loss Formula Verified for Optical Fiber by Simulation and Experiment

Schermer

Cole

2007

IEEE J. Quantum Electron.

350

129

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Abstract-This paper presents an improved curvature loss formula for optical waveguides, which is shown to accurately predict the bend loss of both single-mode and multimode fibers. The formula expands upon a previous formula derived by Marcuse, greatly improving its accuracy for the case of multimode fiber. Also presented are the results of bent fiber simulations using the beam propagation method (BPM), and experimental measurements of bend loss. Agreement among simulation, formula and measurement support the validity of both theoretical methods. BPM simulations showed that the lowest order modes of the bent fiber were reduced to their linearly polarized constituents prior to the onset of significant bend loss. This implies that certain LP mode orientations should propagate with much lower loss than previously expected, and should impact the mode stripping ability of bent large mode area fibers, as employed in fiber lasers and amplifiers.Index Terms-Dielectric waveguides, laser amplifiers, optical fiber amplifiers, optical fiber lasers, optical waveguide theory, waveguide bends.

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Section: Discussionmentioning

confidence: 94%

Section: Bent Fiber Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved Bend Loss Formula Verified for Optical Fiber by Simulation and Experiment

Schermer

Cole

2007

IEEE J. Quantum Electron.

350

129

View full text Add to dashboard Cite

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“…The fiber amplifier was similar to that described in [12]. In this system, high pulse energies and peak powers were enabled by the use of multimode gain fiber, but diffraction-limited beam quality was obtained by coiling of the fiber to suppress propagation of transverse modes other than the fundamental mode (LP 01 ) [13]. Specifically, the Yb-doped fiber had a core diameter and numerical aperture of 25 lm and 0.10, respectively, which corresponds to a V -number of 7.4 and a measured LP 01 mode-field diameter of 19.5 lm at 1064 nm.…”

Section: Introductionmentioning

confidence: 99%

Efficient second, third, fourth, and fifth harmonic generation of a Yb-doped fiber amplifier

Kliner

Teodoro

Koplow

et al. 2002

Optics Communications

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“…Water-cooled heat sinks were employed to protect the fusion splice joint and active fiber from thermally-induced damage. The active fiber is coiled within a diameter of less than 12 cm to ensure good beam quality [23,24] . The output end of the passive laser was angle cleaved to avoid the unwanted reflection.…”

mentioning

confidence: 99%

51.5 W monolithic single frequency 1.97 m Tm-doped fiber amplifier

Wang¹,

Zhang²,

Wang³

et al. 2013

High Pow Laser Sci Eng

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We demonstrate a monolithic single frequency Tm-doped fiber amplifier with output power of 51.5 W. A single frequency fiber laser at 1.97 µm is amplified by a cascaded master oscillator power amplifier (MOPA) system with all-fiber configuration. The optical-to-optical conversion efficiency of the main fiber amplifier is 45%. No amplified spontaneous emission (ASE) or stimulated Brillouin scattering (SBS) effect is observed in the fiber amplifier. The output power could be further scaled by launching more pump power. Keywords:Single .frequency .lasers near .2 µm, which play a significant role in many applications such as coherent LIDAR, coherent beam combining, nonlinear frequency conversion, medicine, atmospheric sensing and spectroscopy, have attracted intense interest and have been widely investigated [1][2][3][4][5][6][7][8][9][10][11][12] . In recent years, 2 µm single frequency fiber lasers have undergone rapid development [11][12][13][14][15][16][17][18][19][20][21][22] since fiber lasers have outstanding advantages including high efficiency, considerable compactness, convenience for thermal management, high beam quality and excellent stability. To realize single frequency fiber laser near 2 µm, distributed Bragg reflector (DBR) [15] and distributed-feedback (DFB) [12,19] techniques have been employed, the output power is limited and should be further amplified for practical applications. At present, most of the reported high power single frequency fiber lasers near 2 µm are achieved based on bulk configuration [3,4] . Meanwhile, monolithic fiber lasers based on all-fiber configuration possess the advantages of being more stable and practical, so it is really attractive to investigate and develop single frequency fiber lasers near 2 µm employing monolithic fiber configuration [20] . An admirable previous work has been done by Gapontsev et al., who demonstrated a 20 W monolithic single frequency fiber amplifier at 1.93 µm in 2007 [18] .In this paper, we demonstrate a monolithic single frequency fiber amplifier at 1.97 µm based on master oscillator stimulated Brillouin scattering (SBS) effect observed in the amplifier, which means the output power can be improved further if the pump power is increased.In the MOPA system, the single frequency seed fiber laser based on ultrashort cavity [16] operates at 1.97 µm and has an output power of 35 mW, and the linewidth is less than 100 kHz. Figure 1 shows the two-stage Tm-doped fiber preamplifier. The first stage of the pre-amplifier consists of a 1550 nm pump laser, a 1550/2000 wavelength division multiplexer (WDM), an isolator (ISO) and a piece of 2.5 m long single cladding Tm-doped fiber (NA is 0.15) with core diameter of 9 µm and cladding diameter of 125 µm. The second stage of the pre-amplifier employs a (2 + 1) × 1 signal-pump combiner and two 793 nm laser diodes (LDs). The amplified 2 µm laser signal was injected into a piece of 8 m long double cladding Tm-doped fiber (DC-TDF) with core diameter of 10 µm and inner cladding diameter of 125 µm. The Tm-do...

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Single-mode operation of a coiled multimode fiber amplifier

Cited by 504 publications

References 20 publications

Improved Bend Loss Formula Verified for Optical Fiber by Simulation and Experiment

Improved Bend Loss Formula Verified for Optical Fiber by Simulation and Experiment

Efficient second, third, fourth, and fifth harmonic generation of a Yb-doped fiber amplifier

51.5 W monolithic single frequency 1.97 m Tm-doped fiber amplifier

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