High-bit-rate long-haul fiber optic communication system...

Optical communications – Transmitter – Having particular modulation

Reexamination Certificate

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C398S187000

Reexamination Certificate

active

10099077

ABSTRACT:
A 90 degree Alternate-Phase (AP) on-off keying (OOK) transmission format for high bit rate, long-haul optical transmission systems employing a chirped or a chirp-free pulse stream generated by a pulse generator (e.g., Mach Zehnder modulator) driven by mixing two electrical signals—one for intensity modulation and another for pulse modulation. These electrical signals may be two properly skewed sinusoidal electrical signals at half the desired data rate thereby generating a pulse stream in which the maximum optical phase modulation occurs at the intensity peak of each pulse and is 90 degrees out of phase with its nearest neighbors.

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Ohirra, R; Ogasahara, D. and Ono, T: “Novel RZ Signal format with Alternate-chirp for Suppression of Nonlinear Degradation in 40 Gb/s based WDM,” Optical Fiber Communication Conference and Exhibit, 2001. OFC 2001 vol. 3, 2001 pp. WM2-1-WM2-3 vol. 3.

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