Apparatus and method to generate carrier suppressed-return...

Details Apparatus and method to generate carrier suppressed-return... Apparatus and method to generate carrier suppressed-return...

2006-08-10

2010-10-19

Liu, Li (Department: 2613)

Optical communications

Transmitter

Having particular modulation

C398S186000, C398S188000, C398S201000, C398S182000

Reexamination Certificate

active

07817922

ABSTRACT:
Provided are an apparatus and a method for generating a CS-RZ optical signal. The apparatus includes: a classifier distributing an input signal into two NRZ (non-return-to-zero) signals with an identical transmission speed; a first signal transformer converting one of the two NRZ signals into a first RZ signal using a full-frequency clock; a second signal transformer converting the other one of the two NRZ input signals into a second RZ signal using a full-frequency clock; a phase adjuster adjusting the first and second RZ signals so that a delay time corresponding to half a period of the input signal exists between the first and second RZ signals; a bias unit adding different DC (direct current) bias voltages to the first and second RZ signals; and a dual electrode optical modulator transforming the two electrical RZ signals into an optical CS-RZ signal.

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Wen et al: “RZ/CSRZ-DPSK and Chirped NRZ Signal Generation Using a Single-State Dual-Electrode Mach-Zehnder Modulator”, IEEE Photonics Technology Letters, vol. 16, No. 11, Nov. 2004, pp. 2466-2468.

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