Design of quasi-phasematched optical frequency converters

Details Design of quasi-phasematched optical frequency converters Design of quasi-phasematched optical frequency converters

2007-10-30

2007-10-30

Doan, Jennifer (Department: 2874)

Optical: systems and elements

Optical frequency converter

C359S328000, C359S332000

Reexamination Certificate

active

11513814

ABSTRACT:
Quasi-phasematching design to provide an approximation to a desired spectral amplitude response A(f) is provided. An initial phase response φ(f) corresponding to A(f) is generated. Preferably, d2φ(f)/df2is proportional to A2(f). Alternatively, φ(f) can be a polynomial in f. A function h(x) is computed such that h(x) and H(f)=A(f)exp(iφ(f)) are a Fourier transform pair. A domain pattern function d(x) is computed by binarizing h(x) (i.e., approximating h(x) with a constant-amplitude approximation). In some cases, the response provided by this d(x) is sufficiently close to A(f) that no further design work is necessary. In other cases, the design can be iteratively improved by modifying φ(f) responsive to a difference between the desired response A(f) and the response provided by domain pattern d(x). Various approaches for binarization are provided. The availability of multiple binarization approaches is helpful for making design trades (e.g., in one example, fidelity to A(f) can be decreased to increase efficiency and to increase domain size).

REFERENCES:
patent: 6021141 (2000-02-01), Nam et al.
patent: 6762876 (2004-07-01), Tilleman et al.

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