Hybrid passive optical network system
AssigneeElectronics and Telecommunications Research Institute
InventorsSeung-Hyun CHO, Jie Hyun LEE, Seung Il MYONG, Sang Soo LEE, Jong Hyun LEE, Eui Suk JUNG, Kwang Ok KIM
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Abstract
Provided is a hybrid passive optical network (PON) system. The hybrid PON system of wavelength division multiplexing (WDM)/time division multiplexing (TDM) may include an optical line terminal (OLT) and an optical network unit (ONU). The OLT and the ONU may transmit a signal based on wavelength reuse using a seed light source and a reflective modulator. The light source may include a seed light source having a single wavelength, two seed light sources having different wavelength bands, and a light source having a wavelength tunable characteristic.
Claims18
An optical line terminal (OLT) of a hybrid passive optical network (PON) system, the OLT comprising:
- a seed light source configured to provide a seed light having a predetermined wavelength;
- an optical transmitter configured to modulate the seed light generated from the seed light source using a reflective modulator, and to transmit a modulated orthogonal frequency division multiplexing (OFDM) downstream optical signal to at least one optical network unit (ONU);
- and
- an optical receiver configured to receive an OFDM upstream optical signal from the at least one ONU,
- wherein the at least one ONU is configured to obtain a wavelength of the OFDM upstream optical signal from the OFDM downstream optical signal and to reuse a portion of the OFDM downstream optical signal as an OFDM upstream optical signal.
At least one optical network unit (ONU) of a hybrid passive optical network (PON) system, the ONU comprising:
- an optical coupler configured to split an orthogonal frequency division multiplexing (OFDM) downstream optical signal transmitted from an optical line terminal (OLT);
- an optical receiver configured to receive a portion of the OFDM downstream optical signal through the optical coupler;
- and
- an optical transmitter configured to modulate the remaining portion of the OFDM downstream optical signal through the optical coupler using a reflective modulator and to transmit a modulated OFDM upstream optical signal to the OLT.
An optical line terminal (OLT) of a hybrid passive optical network (PON) system, the OLT comprising:
- an optical transmitter configured to transmit an orthogonal frequency division multiplexing (OFDM) downstream optical signal to at least one optical network unit (ONU) using a first e wavelength tunable light source;
- and
- an optical receiver configured to receive an OFDM upstream optical signal generated from the at least one ONU based on a second wavelength tunable light source,
- wherein the first wavelength tunable light source and the second wavelength tunable light source output lights having different wavelength bands.
Dependencies are inferred from the claim text.