Fiber optic mode scrambler

Optical waveguides – With optical coupler – Particular coupling function

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385 37, G02B 626

Patent

active

058928669

ABSTRACT:
The present invention is an optical transmission system comprising an optical source, a first lens and a second lens, a multimode optical waveguide, and a phase-only filter. The optical source generates an optical signal having a predetermined wavelength which is received by the first lens. The signal is then sent from the first lens through the phase-only filter and then to the second lens. The second lens then focuses the signal into the multimode optical waveguide. The multimode optical waveguide has predetermined dimensions and has multiple modes. The phase-only filter excites a plurality of modes in the optical waveguide to approximate equilibrium modal power distribution as the optical signal is received into the optical waveguide.

REFERENCES:
patent: 4281893 (1981-08-01), Yamada et al.
patent: 4768853 (1988-09-01), Bhagavatula
patent: 5422897 (1995-06-01), Wyatt et al.
Dubois, et al., "Selective Mode Excitation in Graded-Index Multimode Fiber by a Computer-Generated Optical Mask," Optic Letters, vol. 19, No. 7, Apr. 1, 1194, pp. 433-435.
Kazuhisa, "Mode Scrambler,"Patents Abstracts of Japan, Publ. No. 59062803, Oct. 4, 1984.
Yoshikawa, et al., letter entitled "Single-Mode Separation for Mode-Division Multiplexing by Holographic Filter" IEICE Transactions on Electronics, vol. E77-C, No. 9, Sep. 1994, pp. 1526-1527.
Article entitled "New Iterative Algorithm For The Design of Phase-Only Gratings" by Michael W. Farn of MIT/Lincoln Labortory, L-265, address 244 Wood Street, Lexington, MA 02173-9108 found in SPIE vol. 1555 Computer and Optically Generated Holographic Optics (Fourth in a Series) (1991), pp. 34-42.
Article entitled "Modal Noise Causes and Cures"by Richard E. Epworth, Standard Telecommunication Laboratories Ltd., Harlow, England CM17 9NA (Sep. 1981), pp. 109-115.

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