Optical pulse time spreader and optical code division...

Details Optical pulse time spreader and optical code division... Optical pulse time spreader and optical code division...

2011-05-17

2011-05-17

Vanderpuye, Ken N (Department: 2613)

Optical communications

Transmitter

Having particular modulation

C398S098000, C398S077000, C398S189000, C398S190000, C398S193000, C385S037000, C385S027000

Reexamination Certificate

active

07945171

ABSTRACT:
A phase control arrangement has a structure in which a Superstructured fiber Bragg Grating (SSFBG)40has fifteen unit Fiber Bragg Gratings (FBGs) arranged in series in a waveguide direction. The SSFBG40is fixed to the core of an optical fiber36that includes a core34and cladding32. The difference Δn between the maximum and minimum of the effective refractive index of the optical fiber is 6.2×10−5. 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.

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