The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 2011
Filed:
Dec. 21, 2005
Kensuke Sasaki, Kanagawa, JP;
Akihiko Nishiki, Tokyo, JP;
Kensuke Sasaki, Kanagawa, JP;
Akihiko Nishiki, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A phase control arrangement has a structure in which a Superstructured fiber Bragg Grating (SSFBG)has fifteen unit Fiber Bragg Gratings (FBGs) arranged in series in a waveguide direction. The SSFBGis fixed to the core of an optical fiberthat includes a coreand cladding. The difference Δn between the maximum and minimum of the effective refractive index of the optical fiber is 6.2×10. The phase difference of Bragg reflected light from two unit diffraction gratings that adjoin one another from front to back and provide equal code values is given by 2πM+(π/2), where M is an integer. Further, the phase difference of the Bragg reflected light from two unit diffraction gratings that adjoin one another from front to back and provide different code values is given by 2πM+(2N+1)π+(π/2) where M and N are integers. The ratio P/W between the peak value P and the subpeak value W of the autocorrelation waveform, and the ratio P/C between the peak value P of the autocorrelation waveform and the maximum peak value C of the cross correlation waveform are both large.