Diffractive optical spectral filter having arbitrary...

Details Diffractive optical spectral filter having arbitrary... Diffractive optical spectral filter having arbitrary...

2006-05-23

2006-05-23

Lee, John D. (Department: 2874)

Optical: systems and elements

Diffraction

Using fourier transform spatial filtering

C359S223100, C359S558000

Reexamination Certificate

active

07050235

ABSTRACT:
A diffractive optical filter having a fractional level density s[j] and a transfer function C[m] that is an approximation to a desired Hermitian, passive transfer function B[m] is provided. The fractional level density s[j] is obtained by Fourier (or inverse Fourier) transforming B[m] to obtain t[j], calculating u[j]=t[j]−min(t[j]), calculating v[j]=u[j]/D where D is the sum of u[j] over j, and setting s[j] substantially equal to v[j]. A 2-D tiltable mirror array can be used to provide a 1024 tap optical filter having 10-bit tap resolution. Applications of the invention include laser tuning elements, spectroscopy and wavelength-division multiplexing, switching, and/or filtering.

REFERENCES:
patent: 5757536 (1998-05-01), Ricco et al.
patent: 5905571 (1999-05-01), Butler et al.
patent: 6362879 (2002-03-01), Ranalli
patent: 6469827 (2002-10-01), Sweatt et al.
patent: 2004/0145810 (2004-07-01), Ranalli

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