Optical waveguides – With optical coupler – Plural
Patent
1998-03-13
2000-08-29
Lee, John D.
Optical waveguides
With optical coupler
Plural
385 39, 359130, 359124, G02B 6293
Patent
active
061119962
ABSTRACT:
An monolithic version of optical multiplexer/demultiplexer with an improved spectral characteristic is provided by two diffraction gratings arranged optically in tandem and with a field stop in the coupling between them, the gratings also being arranged to provide free spectral ranges differing by a factor of at least two, and having a coupling between them that carries over into the second grating information concerning the dispersion afforded by the first grating. The field stop is constituted by a pair of etched troughs arranged in the pattern of an open chevron.
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patent: 5832362 (1998-11-01), Trokhan
Ishida, et al., "Loss-Imbalance Equalization in Arrayed-Waveguide-Grating (AWG) Multiplexer Cascades," 8217 Journal of Lightwave Technology 13 (1995) Jun., No. 6, New York, NY USA, pp. 1155-1163.
Tsai, et al., "Multiband Wavelength-Division Demultiplexing with a Cascaded Substrate-Mode Grating Structure," Applied Optics, vol. 34, No. 25, Sep. 1, 1995, pp. 5582-5588.
Integrated Optics N x N Multiplexer on Silicon--C Dragone et al IEE Photonics Letters vol. 3 No. 10. Oct. 1991.
Hao Victoria D.
Lee John D.
Northern Telecom Limited
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