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| Number | Title | Issue Date |
| 7437080 | Optical transmission system having optimized filter wavelength offsets An optical transmission system having optical transmit and receive filters having passbands adjusted or selected for opposite and equal wavelength offsets from the optical wavelength of a carrier or the channel center wavelength. ... | 10/14/2008 |
| 7287213 | Method and system to provide modular parallel precoding in optical duobinary transmission systems A circuit using modular based parallel processing calculates the cumulative parity of a binary number input sequence. The circuit is used, for example, to implement a precoder for an optical duobinary transmission system. The design permits a relatively low-speed ci... | 10/23/2007 |
| 7162163 | Differential complex modulation optical receiver having compensation of Kerr effect phase noise A method and apparatus for reducing nonlinear phase noise that is induced in an optical transmission system by the interaction of optical amplifier noise and Kerr effect. The apparatus includes an intensity-scaled nonlinear phase noise compensator. The phase noise c... | 01/09/2007 |
| 7133620 | Optical FSK receiver having compensation for Kerr effect phase noise A method and apparatus for reducing nonlinear phase noise that is induced in an optical transmission system by the interaction of optical amplifier noise and Kerr effect. The apparatus includes an intensity-scaled non-linear phase noise compensator. The phase noise ... | 11/07/2006 |
| 7013089 | Optical receiver having compensation for Kerr effect phase noise A method and apparatus for reducing nonlinear phase noise that is induced in an optical transmission system by the interaction of optical amplifier noise and Kerr effect. The apparatus includes an intensity-scaled nonlinear phase noise compensator. The phase noise c... | 03/14/2006 |
| 6915084 | Optical compensator having compensation for Kerr effect phase noise A method and apparatus for reducing nonlinear phase noise that is induced in an optical transmission system by the interaction of optical amplifier noise and Kerr effect. The apparatus includes an intensity-scaled nonlinear phase noise compensator. The phase noise c... | 07/05/2005 |
| 6804472 | Transmitter and method using half rate data streams for generating full rate modulation on an optical signal An optical duobinary transmitter. The transmitter uses a half-rate precoder, half-rate non-linear modulation drive circuits and a multiplex modulator for generating duobinary modulation on an optical signal from which full-rate data can be detected without decoding.... | 10/12/2004 |
| 6690894 | Multilevel optical signals optimized for systems having signal-dependent and signal-independent noises, finite transmitter extinction ratio and intersymbol interference Methods and apparatus are described to transmit and receive information encoded in multilevel optical signals that take on at least three intensity levels. Intensity levels of a transmitted multilevel optical signal are optimized to minimize a transmitted... | 02/10/2004 |
| 6592274 | Transmission and reception of duobinary multilevel pulse-amplitude-modulated optical signals using finite-state machine-based encoder Methods and apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals are described. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information ... | 07/15/2003 |
| 6490069 | Transmission and reception of duobinary multilevel pulse-amplitude-modulated optical signals using subtraction-based encoder Methods and apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information bits are encod... | 12/03/2002 |
| 6445476 | Transmission and reception of duobinary multilevel pulse-amplitude-modulated optical signals using subsequence-based encoder Methods and apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals are described. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information ... | 09/03/2002 |
| 6424444 | Transmission and reception of duobinary multilevel pulse-amplitude-modulated optical signals using finite-state machine-based encoder Methods and apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals are described. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information ... | 07/23/2002 |
