Wavelength division multiplexing passive optical network system
First Claim
1. A wavelength division multiplexing passive optical network (WDM PON) system comprising:
- a central office for generating optical signals of different wavelengths, multiplexing the generated optical signals, and outputting the resultant multiplexed optical signal to an optical communication line, the central office receiving an optical signal having the same wavelengths as those of the generated optical signals, and demultiplexing the received optical signal;
a remote node for demultiplexing the optical signal transmitted from the central office via the optical communication line, and outputting the resultant demultiplexed optical signals to distributed optical communication lines, respectively, the remote node multiplexing optical signals respectively transmitted from the distributed optical communication lines, and outputting the resultant multiplexed optical signal to the optical communication line; and
a plurality of optical network units for receiving the optical signals transmitted from the remote node via the distributed optical communication lines, respectively, each of the optical network units generating an optical signal having the same wavelength as that of the optical signal received thereto, and transmitting the generated optical signal to the remote node through an associated one of the distributed optical communication lines,wherein the central office comprises;
a plurality of first transmitters for generating and outputting optical signals of different wavelengths, respectively;
a plurality of first receivers for receiving optical signals having the same wavelengths as those of the optical signals outputted from the first transmitters, respectively;
a first multiplexer/demultiplexer for multiplexing the optical signals respectively outputted from the first transmitters, and outputting the resultant multiplexed optical signal, the first multiplexer/demultiplexer demultiplexing the multiplexed optical signal transmitted from the remote node, and outputting the resultant demultiplexed optical signals; and
a plurality of first optical splitters for distributing the demultiplexed optical signals outputted from the first multiplexer/demultiplexer to respective first transmitters and respective second transmitters,wherein each of the first transmitters is injection-locked by the optical signal distributed by an associated one of the first optical splitters.
1 Assignment
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Accused Products
Abstract
Disclosed is a wavelength division multiplexing passive optical network (WDM PON) system in which an optical signal outputted from a central office is injected into a Fabry-Perot laser diode (F-P LD) as the light source of an optical network unit, so that the output wavelength of the optical network unit is injection-locked at the same wavelength as that of the optical signal outputted from the central office, thereby enabling the optical network unit to output an optical signal having the same wavelength as that of the optical signal outputted from the central office. In accordance with this system, it is possible to transmit and receive forward and backward data at the same wavelength by the unit of channels. Since inexpensive F-P LDs are used as respective light sources of the central office and optical network units, it is possible to efficiently and economically implement a WDM PON system.
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Citations
8 Claims
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1. A wavelength division multiplexing passive optical network (WDM PON) system comprising:
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a central office for generating optical signals of different wavelengths, multiplexing the generated optical signals, and outputting the resultant multiplexed optical signal to an optical communication line, the central office receiving an optical signal having the same wavelengths as those of the generated optical signals, and demultiplexing the received optical signal; a remote node for demultiplexing the optical signal transmitted from the central office via the optical communication line, and outputting the resultant demultiplexed optical signals to distributed optical communication lines, respectively, the remote node multiplexing optical signals respectively transmitted from the distributed optical communication lines, and outputting the resultant multiplexed optical signal to the optical communication line; and a plurality of optical network units for receiving the optical signals transmitted from the remote node via the distributed optical communication lines, respectively, each of the optical network units generating an optical signal having the same wavelength as that of the optical signal received thereto, and transmitting the generated optical signal to the remote node through an associated one of the distributed optical communication lines, wherein the central office comprises; a plurality of first transmitters for generating and outputting optical signals of different wavelengths, respectively; a plurality of first receivers for receiving optical signals having the same wavelengths as those of the optical signals outputted from the first transmitters, respectively; a first multiplexer/demultiplexer for multiplexing the optical signals respectively outputted from the first transmitters, and outputting the resultant multiplexed optical signal, the first multiplexer/demultiplexer demultiplexing the multiplexed optical signal transmitted from the remote node, and outputting the resultant demultiplexed optical signals; and a plurality of first optical splitters for distributing the demultiplexed optical signals outputted from the first multiplexer/demultiplexer to respective first transmitters and respective second transmitters, wherein each of the first transmitters is injection-locked by the optical signal distributed by an associated one of the first optical splitters. - View Dependent Claims (2, 3, 4)
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5. A wavelength division multiplexing passive optical network (WDM PON) system comprising:
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a central office for generating optical signals of different wavelengths, multiplexing the generated optical signals, and outputting the resultant multiplexed optical signal to an optical communication line, the central office receiving an optical signal having the same wavelengths as those of the generated optical signals, and demultiplexing the received optical signal; a remote node for demultiplexing the optical signal transmitted from the central office via the optical communication line, and outputting the resultant demultiplexed optical signals to distributed optical communication lines, respectively, the remote node multiplexing optical signals respectively transmitted from the distributed optical communication lines, and outputting the resultant multiplexed optical signal to the optical communication line; and a plurality of optical network units for receiving the optical signals transmitted from the remote node via the distributed optical communication lines, respectively, each of the optical network units generating an optical signal having the same wavelength as that of the optical signal received thereto, and transmitting the generated optical signal to the remote node through an associated one of the distributed optical communication lines, wherein each of the optical network units comprises; a second transmitter for generating and outputting an optical signal having the same wavelength as that of an associated one of the demultiplexed optical signals outputted from the remote node; a second receiver for receiving the associated optical signal outputted from the remote node; and a second optical splitter for distributing the associated optical signal outputted from the remote node to the second transmitter and the second receiver; and wherein the second transmitter is injection-locked by the associated optical signal distributed by the second optical splitter. - View Dependent Claims (6, 7, 8)
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Specification