Optical pulse time spreader

Details Optical pulse time spreader Optical pulse time spreader

2007-04-11

2008-10-21

Font, Frank G (Department: 2883)

Optical waveguides

With optical coupler

Input/output coupler

C385S014000

Reexamination Certificate

active

07440656

ABSTRACT:
An optical pulse time spreader which can generate a chip pulse string of which intensity is equalized. The reflectances R1, R2and Rkof the first, second and k-th (k is an integer which satisfies 3≦k≦J) unit FBG are given by the following formulae respectively.in-line-formulae description="In-line Formulae" end="lead"?R1=Pc(constant)   (a)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?R2=Pc/(1−R1)2  (b)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Rk=(Pc1/2−Pk1/2)2/{(1−R1)2·(1−R2)2. . . (1−Rk-1)2}   (c-1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Rk=(Pc1/2+Pk1/2)2/{(1−R1)2·(1−R2)2. . . (1−Rk-1)2}   (c-2)in-line-formulae description="In-line Formulae" end="tail"?Here Pcis an arbitrary constant, and Pkis an intensity of a triple reflection chip pulse which is output for the k-th time. The formulae (c-1) and (c-2) are the reflectance of the k-th unit diffraction grating when the phase difference between the single reflection chip pulse, which is output for the k-th time, and the triple reflection chip pulse, which is output for the k-th time, is 0 and π respectively.

REFERENCES:
patent: 6389045 (2002-05-01), Mann et al.
patent: 2006/0269286 (2006-11-01), Sasaki
patent: 2007/0223927 (2007-09-01), Sasaki et al.
“Optical fiber diffraction grating”, Toru Mizumani, Applied Physics, vol. 67, No. 9, pp. 1029-1034 (1998), Only Figures/ No Translation.
“Development of Encoder/Decoder for OCDM using SSFBG”, Akihiro Nishiki et al., Technical Report of IEICE, OFT 2002-66, (Nov. 2002), Only Figures/No Translation.
“Optical code division multiplexing network”, Hideyuki Sotobayashi, Applied Physics, vol. 71, No. 7, pp. 853-859 (2002), Only Figures/No Translation.
“Experimental Demonstration of Performance Improvement of 127-Chip SSFBG En/Decoder Using Apodization Technique”, Koji Matsushima et al., IEEE Photonics Technology Letters, vol. 16, No. 9, pp. 2192-2194, Sep. 2004.

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