Integrated bi-directional axial gradient refractive index/diffra

Details Integrated bi-directional axial gradient refractive index/diffra Integrated bi-directional axial gradient refractive index/diffra

1997-12-13

2000-01-04

Bovernick, Rodney

Optical waveguides

With optical coupler

Plural

385 33, 385 34, 385 37, 385 14, 385 49, 385 39, 359130, 359131, 372 50, G02B 628

Patent

active

060118849

ABSTRACT:
A wavelength division multiplexer is provided that integrates an axial gradient refractive index element with a diffraction grating to provide efficient coupling from a plurality of input optical sources (each delivering a single wavelength to the device) which are multiplexed to a single polychromatic beam for output to a single output optical receiver. The device comprises: (a) means for accepting optical input from at least one optical source, the means including a planar surface; (b) a coupler element comprising (1) an axial gradient refractive index collimating lens having a planar entrance surface onto which the optical input is incident and (2) a homogeneous index boot lens affixed to the axial gradient refractive index collimating lens and having a planar but tilted exit surface; (c) a diffraction grating, such as a Littrow diffraction grating, on the tilted surface of the homogeneous index boot lens which combines a plurality of spatially separated wavelengths from the optical light; and (d) means to output at least one multiplexed, polychromatic output beam, the means including a planar surface. The device may be operated in the forward direction as a multiplexer or in the reverse direction as a demultiplexer.

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