Diffraction-compensated integrated WDM

Details Diffraction-compensated integrated WDM Diffraction-compensated integrated WDM

2006-04-18

2006-04-18

Payne, David C. (Department: 2638)

Optical communications

Multiplex

Wavelength division or frequency division

C385S024000, C385S037000

Reexamination Certificate

active

07031610

ABSTRACT:
A diffraction-compensated WDM (wavelength division multiplexer) uses TTFs (thin film filters) as concave mirrors. The WDM has a plurality of filter elements for guiding the optical signal along a predetermined optical path, each filter element being transparent to a predetermined wavelength range and including compensating means for at least partially compensating for diffraction of the optical signal. Each filter element has a thin film coated on a substrate, and the compensating means is a curved surface of each thin film. The WDM is more robust than prior art WDM devices using flat TTFs.

REFERENCES:
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patent: 6453094 (2002-09-01), Yue
patent: 6751373 (2004-06-01), Jeong
Haruo Takashashi, Temperature Stability of Thin-film narrow-bandpass filters produced by ion-assisted deposition, Feb. 1, 1995, vol. 34, N. 4, Applied Optics, pp. 667-675.
G. P. Agrawal, Fiber Communication Systems 2ndEd., John Wiley & Sons (1997), pp. 28-29.
B.E.A. Saleh & M.C. Teich, Fundamentals of Photonics, John Wiley & Sons (1991) Chapter 3, pp. 80-107.
B.E.A. Saleh & M.C. Teich, Fundamentals of Photonics, John Wiley & Sons (1991), p. 16.

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