Wavelength division multiplexing-passive optical network system
First Claim
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1. A wavelength division multiplexing-passive optical network system, comprising:
- an optical line termination located at a central office, and for transmitting an optical signal to a subscriber side and receiving an optical signal from the subscriber side;
a seed light module located at the central office, and for supplying a spectrum-sliced seed light including a plurality of wavelengths to corresponding optical transmitters of the optical line termination; and
an optical network unit located at the subscriber side, and for receiving an optical signal from the optical line termination, converting the same into an electric signal to obtain downstream information and transmitting an optical signal containing upstream data to the optical line termination, the optical network unit includingan optical receiver for receiving a first portion of the optical signal and restoring the downstream information, andan optical transmitter for receiving a second portion of the optical signal, changing the received portion into a pseudo continuous wave light by removing the downstream information, and modulating the pseudo continuous wave light into the upstream data.
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Abstract
The present invention proposes a wavelength division multiplexing-passive optical network (WDM-PON) system which transmits downstream data to an optical network unit (ONU) as an optical line termination (OLT) receives seed light from a spectrum-sliced external light source module. One characteristic of the proposed WDM-PON system is that optical transmitters of the OLT and ONU are operated regardless of optical wavelength. Another characteristic of the proposed WDM-PON system is that a conventional TDMA-PON (E-PON or G-PON) ONU can be accommodated without a change.
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Citations
16 Claims
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1. A wavelength division multiplexing-passive optical network system, comprising:
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an optical line termination located at a central office, and for transmitting an optical signal to a subscriber side and receiving an optical signal from the subscriber side; a seed light module located at the central office, and for supplying a spectrum-sliced seed light including a plurality of wavelengths to corresponding optical transmitters of the optical line termination; and an optical network unit located at the subscriber side, and for receiving an optical signal from the optical line termination, converting the same into an electric signal to obtain downstream information and transmitting an optical signal containing upstream data to the optical line termination, the optical network unit including an optical receiver for receiving a first portion of the optical signal and restoring the downstream information, and an optical transmitter for receiving a second portion of the optical signal, changing the received portion into a pseudo continuous wave light by removing the downstream information, and modulating the pseudo continuous wave light into the upstream data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A wavelength division multiplexing-passive optical network system, comprising:
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an optical line termination located at a central office, and for transmitting a plurality of optical signals to a subscriber side and receiving a plurality of optical signals from the subscriber side; a seed light module located at the central office, and for supplying a spectrum-sliced seed light including a plurality of wavelengths to corresponding optical transmitters of the optical line termination; an optical network unit located at the subscriber side, and for receiving an optical signal from the optical line termination, converting the same into an electric signal to obtain downstream information and transmitting an optical signal containing upstream data to the optical line termination; an optical wavelength conversion device for wavelength-converting upstream and downstream signals into signals of different wavelength bands; and a remote node located at a remote location, for wavelength-demultiplexing wavelength-multiplexed signals from the optical line termination and outputting the demultiplexed signals to the subscriber side, and wavelength-multiplexing optical signals from the subscriber side and outputting the multiplexed signals to the optical line termination, the remote node including an optical wavelength multiplexer for wavelength-demultiplexing the wavelength-multiplexed signals transmitted from the optical line termination and wavelength-multiplexing the optical signals from the subscriber side, and an optical filter for delivering an optical signal between the optical wavelength multiplexer and the optical wavelength conversion device, wherein the optical wavelength conversion device is located at the remote node or at the subscriber side. - View Dependent Claims (15, 16)
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Specification