Microlenses for coupling optical fibers to elliptical light beam

Details Microlenses for coupling optical fibers to elliptical light beam Microlenses for coupling optical fibers to elliptical light beam

1992-02-28

1993-10-26

Bovernick, Rodney B.

Electric heating

Metal heating

By arc

21912166, 385 33, B23K 2600

Patent

active

052568512

ABSTRACT:
An asymmetric hyperbolic microlens on the end of a single-mode optical fiber enhances the fiber's coupling to elliptical laser beams. The lenses, with controlled eccentricity ratios, are made by micromachining the end of the fiber with a pulsed CO.sub.2 laser as the fiber is directed, preferably by computer control, about the focused laser beam. Coupling efficiencies of 90 percent (-0.75 dB) have been realized with single transverse mode lasers at a wavelength of 0.98 .mu.m having an approximately 3 to 1 beam ellipicity. With multimode lasers at 1.48 .mu.m having similar elliptical beams, the asymmetric lenses demonstrate an almost 2 dB increase in coupling efficiency over symmetric hyperbolic microlenses. Such lasers are useful to pump erbium-doped fiber amplifiers. About 120 mw was coupled from such a laser into single-mode fiber.

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patent: 5061342 (1991-10-01), Jones
M. Saruwatari, et al., Efficient Laser Diode to Single-Mode Fiber Coupling Using a Combination of Two Lenses . . . , IEEE Jrn. of Quantum Electronics, vol. QE17, No. 6, Jun. 1981 pp. 1021-1027.
V. S. Shah, et al., Efficient Power Coupling from a 980-nm, Broad-Area Laser to a Single-Mode Fiber Using a Wedge-Shaped . . . , Jrnl. Lightwave Technology, vol. 8, No. 9, Sep. 1990, pp. 1313-1318.

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