Optical pulse time spreading device

Details Optical pulse time spreading device Optical pulse time spreading device

2011-07-19

2011-07-19

Vanderpuye, Ken N (Department: 2613)

Optical communications

Multiplex

Code division multiplexing

C398S078000, C398S098000, C398S190000, C398S188000

Reexamination Certificate

active

07983561

ABSTRACT:
An optical pulse time spreading device includes S optical pulse time spreading elements that spread input optical pulses into trains of (N×j) chip pulses, where j is an integer greater than zero, S is an integer greater than one, and N is an integer equal to or greater than S. In the chip pulse trains output by the n-th optical pulse time spreading element (n=1, 2, . . . , S), the light in successive chip pulses is shifted in phase by successive integer multiples of the quantity 2π{a+(n−1)/N}, where a is an arbitrary constant (0≦a<1). In an optical code-division multiplexing system, this optical pulse time spreading device produces an autocorrelation wave with a high energy and a high signal-to-noise ratio.

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