US 7,469,102 B2
Wavelength-division-multiplexing passive optical network utilizing fiber fault detectors and/or wavelength tracking components
Chang-Hee Lee, Taejon (Korea, Republic of); and Kwang-Uk Chu, Taejon (Korea, Republic of)
Assigned to Novera Optics, Inc., Santa Clara, Calif. (US)
Appl. No. 10/530,445
PCT Filed Apr. 18, 2003, PCT No. PCT/US03/12054
§ 371(c)(1), (2), (4) Date Apr. 05, 2005,
PCT Pub. No. WO2004/034621, PCT Pub. Date Apr. 22, 2004.
Claims priority of application No. 10-2002-0060868 (KR), filed on Oct. 07, 2002.
Prior Publication US 2005/0286895 A1, Dec. 29, 2005
Int. Cl. H04J 14/02 (2006.01)
U.S. Cl. 398—79  [398/66; 398/67; 398/68; 398/70; 398/71; 398/72; 398/33; 398/31; 398/38; 398/177; 398/91; 398/93; 398/94; 398/95; 398/158; 398/156; 398/192; 398/195; 398/196; 398/197; 385/24; 385/37; 385/14; 385/15; 385/27; 372/32; 372/34; 372/36; 372/38.02] 31 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a wavelength tracking component to determine a difference between transmission band of wavelengths of a first multiplexer/demultiplexer and a second multiplexer/demultiplexer in order to provide a control signal to match the transmission band of wavelengths of the first multiplexer/demultiplexer and the second multiplexer/demultiplexer, wherein the first multiplexer/demultiplexer is located in a first location and the second multiplexer/demultiplexer is located in a second location remote from the first location, wherein the first multiplexer/demultiplexer receives a first optical signal containing a first band of wavelengths; the second multiplexer/demultiplexer receives a second optical signal containing a second band of wavelengths; and wherein the wavelength tracking component determines the difference based on measuring an optical power of a third optical signal containing the second band of wavelengths after passing through the first multiplexer/demultiplexer; and
a transmission wavelength controller to alter an operational parameter of the first multiplexer/demultiplexer based on the control signal to control the transmission band of wavelengths of the first multiplexer/demultiplexer.