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Polarization-maintaining performance of large effective area, higher order modes fiber in a coiled configuration
Author(s): Raja Ahmad; Jeffrey W. Nicholson; Kazi S. Abedin; Paul S. Westbrook; Clifford Headley; Patrick W. Wisk; Eric M. Monberg; Man F. Yan; David J. DiGiovanni
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Paper Abstract

Scaling the power-level of fiber sources has many practical advantages, while also enabling fundamental studies on the light-matter interaction in amorphous guiding media. In order to scale the power-level of fiber-sources without encountering nonlinear impairments, a strategy is to increase the effective-area of the guided optical-mode. Increasing the effective-area of the fundamental mode in a fiber, however, presents the challenges of increased susceptibility to mode-distortion and effective-area-reduction under the influence of bends. Therefore, higher-order-mode (HOM) fibers, which guide light in large effective-area (Aeff) Bessel-like modes, are a good candidate for scaling the power-level of robust fiber-sources. Many applications of high-power fiber-sources also demand a deterministic control on the polarization-state of light. Furthermore, a polarization-maintaining (PM)-type HOM fiber can afford the added possibility of coherent-beam combination and polarization multiplexing of high-power fiber-lasers. Previously, we reported polarization-maintaining operation in a 1.3 m length of PM-HOM fiber that was held straight. The PM-HOM fiber guided Bessel-like modes with Aeff ranging from 1200-2800 μm2. In this work, we report, for the first time, that the polarization-extinction-ratio (PER) of the HOM exceeds 10 dB in an 8 m long fiber that is coiled down to a diameter of 40 cm. This opens a path towards compact and polarization-controlled high-power fiber-systems.

Paper Details

Date Published: 26 February 2018
PDF: 6 pages
Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105121Q (26 February 2018); doi: 10.1117/12.2290484
Show Author Affiliations
Raja Ahmad, OFS Labs. (United States)
Jeffrey W. Nicholson, OFS Labs. (United States)
Kazi S. Abedin, OFS Labs. (United States)
Paul S. Westbrook, OFS Labs. (United States)
Clifford Headley, OFS Labs. (United States)
Patrick W. Wisk, OFS Labs. (United States)
Eric M. Monberg, OFS Labs. (United States)
Man F. Yan, OFS Labs. (United States)
David J. DiGiovanni, OFS Labs. (United States)


Published in SPIE Proceedings Vol. 10512:
Fiber Lasers XV: Technology and Systems
Ingmar Hartl; Adrian L. Carter, Editor(s)

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