Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2005-12-27
2005-12-27
Phan, Hanh (Department: 2638)
Optical communications
Transmitter
Having particular modulation
C398S182000, C398S186000, C398S188000, C398S189000, C398S194000, C398S195000, C398S198000, C398S154000, C398S155000, C398S079000, C398S091000, C398S095000, C398S045000
Reexamination Certificate
active
06980746
ABSTRACT:
A method and system for generating both return-to-zero (RZ) and carrier suppressed return-to-zero (CSRZ) shaped signals using only a single optical modulator. The system includes: a switch for receiving a data signal and a clock signal as inputs, and outputting a voltage signal; a unit for controllably adjusting the phase of said clock signal before input to the switch; an optical modulator for receiving a continuous wave light (CW) signal and the voltage signal as inputs, and outputting one of an RZ and a CSRZ signal. To generate a CSRZ signal, the optical modulator is biased at a transmission minimum level signal. To generate an RZ signal, the optical modulator is biased at a transmission maximum level and the clock signal is phase shifted. Also disclosed is an optical communication transceiver including a plurality of optical modulator circuits generating both RZ and CSRZ signals. The transceiver also includes a wavelength division multiplexer for combining the generated signals from the plurality of optical modulator circuits for transmission.
REFERENCES:
patent: 5521738 (1996-05-01), Froberg et al.
patent: 5828477 (1998-10-01), Nilsson et al.
patent: 5991471 (1999-11-01), Yu
patent: 6014479 (2000-01-01), Darcie
patent: 6072615 (2000-06-01), Mamyshev
patent: 6718142 (2004-04-01), Murai
patent: 0 957 596 (1999-11-01), None
patent: 0 964 538 (1999-12-01), None
patent: 1 041 754 (2000-04-01), None
Article—“320 Gbit/s (8+40 Gbit/s) WDM transmission over 367-km zero-dispersion-flattened line with 120-km repeater spacing using carrier-suppressed return-to-zero pulse format”—Yutaka Miyamoto, et al., PdP4-1 through PdP4-4.
Article—“100 Gb/s Error Free Transmission over 9100 km using Twenty 5 Gb/s WDM Channels”—Neal S. Bergano, et al., Pd23-1/419 through Pd23-4/422.
Magazine—“A Journal of the AT&T Companies”, AT&T Technical Journal, Jan./Feb. 1995, vol. 74, No. 1.
Article—“40-GHz Pulse Train Generation Using Soliton Compression of a Mach-Zehnder Modulator Output,” IEEE Photonics Technology Letter, vol. 7, No. 1, Jan. 1995, Eric A. Swanson et al., pp. 114-116.
Dorsal Networks Inc.
Phan Hanh
LandOfFree
Electronic RZ/CSRZ signal generation for optical... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electronic RZ/CSRZ signal generation for optical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic RZ/CSRZ signal generation for optical... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3475844