Loop-back wavelength division multiplexing passive optical network
First Claim
1. An apparatus for managing faults of a loop-back Wavelength Division Multiplexing Passive Optical Network (WDM-PON), the WDM-PON having a plurality of light sources located in a central office, assigned to optical network terminals and configured to output downstream signals using unique wavelengths, a central office optical multiplexer for multiplexing the optical signals output from the plurality of central office light sources, a remote node optical demultiplexer for separating the multiplexed downstream signal according to a wavelength through demultiplexing and providing the separated downstream signals to corresponding optical network terminals, a remote node optical multiplexer for multiplexing upstream signals remodulated by the plurality of optical network terminals, a central office optical demultiplexer for demultiplexing the multiplexed upstream signal according to a wavelength, and a plurality of central office receivers for receiving and restoring the demultiplexed upstream signals, the apparatus comprising:
- a control light source located in front of the central office optical multiplexer;
loop-back means for transmitting control light, which is output from the control light source, to the central office through the remote node optical demultiplexer or remote node optical multiplexer;
a control light receiver for receiving looped-back control light; and
a control unit for maintaining power of the upstream signals, which are received by the central office receivers, and power of the control light, which is received by the control light receiver, at a maximum.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed herein is an apparatus and method for managing faults of a loop-back Wavelength Division Multiplexing Passive Optical Network (WDM-PON). The apparatus includes a control light source as well as a plurality of light sources in a central office, a loop-back means for transmitting control light to the central office through a remote node optical demultiplexer or remote node optical multiplexer in a remote node, a control light receiver for receiving looped-back control light, and a control unit for maintaining power of the upstream signals, which are received by central office receivers, and power of the control light, which is received by the control light receiver, at a maximum.
-
Citations
23 Claims
-
1. An apparatus for managing faults of a loop-back Wavelength Division Multiplexing Passive Optical Network (WDM-PON), the WDM-PON having a plurality of light sources located in a central office, assigned to optical network terminals and configured to output downstream signals using unique wavelengths, a central office optical multiplexer for multiplexing the optical signals output from the plurality of central office light sources, a remote node optical demultiplexer for separating the multiplexed downstream signal according to a wavelength through demultiplexing and providing the separated downstream signals to corresponding optical network terminals, a remote node optical multiplexer for multiplexing upstream signals remodulated by the plurality of optical network terminals, a central office optical demultiplexer for demultiplexing the multiplexed upstream signal according to a wavelength, and a plurality of central office receivers for receiving and restoring the demultiplexed upstream signals, the apparatus comprising:
-
a control light source located in front of the central office optical multiplexer;
loop-back means for transmitting control light, which is output from the control light source, to the central office through the remote node optical demultiplexer or remote node optical multiplexer;
a control light receiver for receiving looped-back control light; and
a control unit for maintaining power of the upstream signals, which are received by the central office receivers, and power of the control light, which is received by the control light receiver, at a maximum. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A method of managing faults of a loop-back WDM-PON, the WDM-PON having a plurality of light sources located in a central office, assigned to optical network terminals and configured to output downstream signals using unique wavelengths, a central office optical multiplexer for multiplexing the optical signals output from the plurality of central office light sources, a remote node optical demultiplexer for separating the multiplexed downstream signal according to a wavelength through demultiplexing and providing the separated downstream signals to corresponding optical network terminals, a remote node optical multiplexer for multiplexing upstream signals remodulated by the plurality of optical network terminals, a central office optical demultiplexer for demultiplexing the multiplexed upstream signal according to a wavelength, and a plurality of central office receivers for receiving and restoring the demultiplexed upstream signals, the method comprising:
-
the first step of multiplexing control light output from a control light source, along with the downstream signal;
the second step of passing the control light through the remote node optical demultiplexer and the remote node optical multiplexer, multiplexing the control light along with the upstream signal, and transmitting the multiplexed signal to the central office in a loop-back manner;
the third step of separating the signal, which is received by the central office, into the control light and the upstream signal by demultiplexing the signal; and
the fourth step of maintaining power of the upstream signals received by the central office receivers and power of the control light received by the control light receiver at a maximum. - View Dependent Claims (19, 20, 21, 22, 23)
-
Specification