1
Charles Mao
Xiaoping Charles Mao: Power equalizer in a multiple wavelength bidirectional lightwave amplifier. MCI Communications Corporation, July 20, 1999: US05926590 (18 worldwide citation)

A system and method for optimizing the performance, in a multichannel optical transmission system, of an optical signal regenerator, by compensating for input signal power fluctuation and for output signal gain change, and by mildly filtering individual wavelengths between gain block stages. A syste ...


2
Charles Mao
Joseph C Cook, Xiaoping Charles Mao: Dense WDM in the 1310 nm band. MCI Communications Corporation, March 28, 2000: US06043914 (16 worldwide citation)

Dense wavelength division multiplexing within a 1310 nm band is accomplished over a single mode fiber. Carrier wavelengths are selected from within two windows, a low subband and/or a high subband, on either side of a guardband. The guardband includes the zero dispersion wavelength .lambda..sub.0 of ...


3
Charles Mao
Xiaoping Charles Mao: Multiple wavelength bidirectional lightwave amplifier. MCI Communications, November 18, 1997: US05689594 (9 worldwide citation)

A system and method for optimizing the performance, in a multichannel optical transmission system, of an optical signal regenerator, by compensating for input signal power fluctuation and for output signal gain change, and by mildly filtering individual wavelengths between gain block stages. A syste ...


4
Charles Mao
Andrew Niall Robinson, Xiaoping Charles Mao: PMD characterization across multiple optical channels of an optical link. MCI WorldCom, December 10, 2002: US06493116 (6 worldwide citation)

A fiber optic communications link having PMD characterization across multiple optical channels to identify PMD problems. The communications link has adaptive PMD controls employed along the optical link, whereby PMD phenomena detected by instruments, such as PMD compensators, are interpreted as bein ...


5
Charles Mao
Xiaoping Charles Mao: Method of avoiding excessive polarization mode dispersion in an optical communications link. WorldCom, January 20, 2004: US06681081 (6 worldwide citation)

A method and apparatus for managing state-of-polarization (SOP) controllers along an optical communications link. When the polarization-mode dispersion (PMD) in the link exceeds a preset limit as determined by a PMD compensator, the SOP controller is directed to change rotation angle in an arbitrary ...


6
Charles Mao
Niall Robinson, Charles Mao, Frank A McKiel: Fault isolation of an optical link by correlating PMD events with other measurements. MCI WorldCom, June 11, 2002: US06404520 (5 worldwide citation)

A method and apparatus performing fault management in an optical communications system including a polarization mode dispersion (PMD) compensator. The method and apparatus utilizes a controller receiving notifications indicative of PMD in the system, as well as at least one indicator from a system d ...


7
Charles Mao
Niall Robinson, Charles Mao, Frank A McKiel: Fault isolation of an optical link by correlating PMD events with other measurements. Worldcom, May 27, 2003: US06570682 (5 worldwide citation)

A method and apparatus performing fault management in an optical communications system including a polarization mode dispersion (PMD) compensator. The method and apparatus utilizes a controller receiving notifications indicative of PMD in the system, as well as at least one indicator from a system d ...


8
Charles Mao
Xiaoping Charles Mao: Method of avoiding excessive polarization mode dispersion in an optical communications link. WorldCom, May 28, 2002: US06396606 (5 worldwide citation)

A method and apparatus for managing state-of-polarization (SOP) controllers along an optical communications link. When the polarization-mode dispersion (PMD) in the link exceeds a preset limit as determined by a PMD compensator, the SOP controller is directed to change rotation angle in an arbitrary ...


9
Charles Mao
Xiaoping Charles Mao: Method of avoiding excessive polarization mode dispersion in an optical communications link. Harrity & Snyder, September 19, 2002: US20020131129-A1

A method and apparatus for managing state-of-polarization (SOP) controllers along an optical communications link. When the polarization-mode dispersion (PMD) in the link exceeds a preset limit as determined by a PMD compensator, the SOP controller is directed to change rotation angle in an arbitrary ...


10
Charles Mao
Andrew Niall Robinson, Xiaoping Charles Mao: PMD characterization across multiple optical channels of an optical link. Harrity & Snyder, March 28, 2002: US20020036811-A1

A fiber optic communications link having PMD characterization across multiple optical channels to identify PMD problems. The communications link has adaptive PMD controls employed along the optical link, whereby PMD phenomena detected by instruments, such as PMD compensators, are interpreted as bein ...