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.
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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
16 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A ring type wavelength division multiplexing passive optical network (WDM PON) system comprising:
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a central office including a first multiplexer/demultiplexer adapted to perform a multiplexing/demultiplexing operation for normal signals to be used in a normal state, and a second multiplexer/demultiplexer adapted to perform a multiplexing/demultiplexing operation self-healing signals to be used for a self-healing purpose, the central office generating optical signals of N different wavelengths, each of the first and second multiplexers/demultiplexers multiplexing the generated optical signals, and transmitting the resultant multiplexed optical signal to optical network units through a single optical fiber, while demultiplexing a multiplexed optical signal received from the single optical fiber, thereby detecting data generated from the optical network units; and
remote nodes respectively including bi-directional add/drop devices connected to respective optical network units, the remote nodes establishing a ring type distribution network in cooperation with the first and second multiplexers/demultiplexers of the central office, each of the bi-directional add/drop devices including first and second WDM filters respectively having opposite signal travel directions, the first WDM filter performing an add/drop operation for associated ones of the normal signals, the second WDM filter performing an add/drop operation for associated ones of the self-healing signals. - View Dependent Claims (11, 12, 13, 15)
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14. A bus type wavelength division multiplexing passive optical network (WDM PON) system including a central office, and a remote node connected to the central office via a single optical fiber while being connected to a plurality of optical network units via optical fibers, respectively,
wherein the central office generates optical signals of N different wavelengths, multiplexes the generated optical signals through a multiplexer, transmits the resultant multiplexed optical signal to the remote node through the single optical fiber, receives a multiplexed optical signal from the remote node, and demultiplexes the received multiplexed optical signal through a demultiplexer, thereby detecting data generated from the optical network units; - and
wherein the remote node includes bi-directional add/drop elements connected to respective optical network units, thereby establishing a bus type distribution network, each of the bi-directional add/drop elements drops an optical signal having a selected wavelength from optical signals of N different wavelengths inputted to an input port thereof, to a drop port thereof in accordance with a reflection operation thereof, and transmits the optical signals of the remaining wavelengths through an output port thereof, while reversibly reflecting an optical signal having the selected wavelength inputted to the drop port toward the input port to output the reflected optical signal to the central office. - View Dependent Claims (16)
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Specification