LOOPBACK-TYPE WAVELENGTH DIVISION MULTIPLEXING PASSIVE OPTICAL NETWORK SYSTEM
First Claim
1. A loopback-type WDM-PON (wavelength division multiplexing passive optical network) system comprising:
- a central office converting downstream signals into downstream optical SCM (subcarrier multiplexed) signals to wavelength-multiplex and transmit the downstream SCM signals, or receiving and demodulating upstream optical OOK (on-off keying) signals to convert the upstream optical OOK signals into upstream signals;
a remote node receiving the wavelength-multiplexed downstream optical SCM signals and wavelength-demultiplexing and transmitting the downstream optical SCM signals, or receiving the upstream optical OOK signals and wavelength-multiplexing and transmitting the upstream optical OOK signals; and
subscriber interface units dividing the downstream optical SCM signals into first and second optical SCM signals, converting the first optical SCM signals into downstream signals, and modulating the upstream signals to the optical OOK signals by using the second optical SCM signals to transmit the optical OOK signals to the remote node.
1 Assignment
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Accused Products
Abstract
Provided is a loopback-type wavelength division multiplexing passive optical network (WDM-PON) system including: a central office converting downstream signals into downstream optical subcarrier multiplexed (SCM) signals to wavelength-multiplex and transmit the downstream SCM signals, or receiving and demodulating upstream optical on-off keying (OOK) signals to convert the upstream optical OOK signals into upstream signals; a remote node receiving the wavelength-multiplexed downstream optical SCM signals and wavelength-demultiplexing and transmitting the downstream optical SCM signals, or receiving the upstream optical OOK signals and wavelength-multiplexing and transmitting the upstream optical OOK signals; and subscriber interface units dividing the downstream optical SCM signals into first and second optical SCM signals, converting the first optical SCM signals into downstream signals, and modulating the upstream signals to the optical OOK signals by using the second optical SCM signals to transmit the optical OOK signals to the remote node. Accordingly, stable transmission quality can be guaranteed and system implementation costs can be reduced.
25 Citations
17 Claims
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1. A loopback-type WDM-PON (wavelength division multiplexing passive optical network) system comprising:
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a central office converting downstream signals into downstream optical SCM (subcarrier multiplexed) signals to wavelength-multiplex and transmit the downstream SCM signals, or receiving and demodulating upstream optical OOK (on-off keying) signals to convert the upstream optical OOK signals into upstream signals; a remote node receiving the wavelength-multiplexed downstream optical SCM signals and wavelength-demultiplexing and transmitting the downstream optical SCM signals, or receiving the upstream optical OOK signals and wavelength-multiplexing and transmitting the upstream optical OOK signals; and subscriber interface units dividing the downstream optical SCM signals into first and second optical SCM signals, converting the first optical SCM signals into downstream signals, and modulating the upstream signals to the optical OOK signals by using the second optical SCM signals to transmit the optical OOK signals to the remote node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A loopback-type WDM-PON system including a central office, a remote node, and subscriber interface units, wherein the subscriber interface unit comprises:
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a coupler dividing a downstream optical SCM signal transmitted from the remote node into first and second optical SCM signals; an optical receiver converting the first optical SCM signal to an SCM signal; a frequency down converter converting the SCM signal to a downstream signal; and an RSOA generating an upstream signal by using the second optical SCM signal as a seed light.
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Specification