Wavelength division multiplexed-passive optical network capable of high-speed transmission of an optical signal by using modulation format having high spectral efficiency
AssigneeKorea Advanced Institute of Science and Technology
InventorsChang-Hee Lee, Ki-Man Choi, Sil-Gu Mun, Jung-Hyung Moon
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Abstract
The present invention discloses a wavelength-division multiplexing passive optical network (WDM-PON) capable of high-bandwidth transmission for optical signals by using modulation format having high spectral efficiency. The WDM-PON according to the present invention provides a larger capacity and higher bandwidth transmission economically (at lower costs) by using a modulation format where spectral efficiency (a transmission bit number per a unit band width) is high, while using a low noise part of a light source.
Claims13
A wavelength-division multiplexing passive optical network capable of high-bandwidth transmission for optical signals comprising:
- a low noise broadband light source (BLS) which is oscillating in a plurality of oscillating modes;
- a first circulator and a second circulator respectively being connected to the low noise BLS;
- a first arrayed waveguide grating (AWG) being positioned at an optical line termination (OLT) and having n-numbered output ports;
- n-numbered optical transceivers (TRx) (OLT1 to OLTn) respectively connected to the first AWG;
- a second AWG being positioned at a remote node (RN) and having n-numbered output ports;
- a single mode fiber (SMF) being used for transmission of signals transmitted through the first AWG and the second AWG;
- a first wavelength division multiplexing (WDM) filter being connected to the first circulator, the second circulator, and the first AWG, respectively;
- a second WDM filter being connected to the first circulator, the second circulator, and the SMF, respectively;
- n-numbered optical transceivers (TRx) (ONT1 to ONTn) being positioned at subscribers (ONT) and respectively connected to the second AWG;
- and
- n-numbered SMFs for separate transmission being connected between the second AWG and the n-numbered optical transceivers (TRx) (ONT1 to ONTn),
- wherein each of the numbered optical transceivers (TRx) (ONT1 to OLTn) at the OLT and each of the n-numbered optical transceivers (TRx) (ONT1 to ONTn) at the subscribers (ONT) comprises:
- a WDM filter into which an optical signal, split through the first AWG and the second AWG, is inputted;
- an optical transmitter (Tx) being connected to the WDM filter and for transmitting optical signals having different wavelength bands;
- and
- an optical receiver (Rx) being connected to the WDM filter and for receiving the optical signals having different wavelength bands,
- wherein the optical transmitter (Tx) comprises:
- a wavelength-locked F-P LD by injecting the low noise BLS;
- a driver for modulating the wavelength-locked F-P LD;
- and
- an encoder being connected to the driver and for transforming data to be transmitted into a modulation format having high spectral efficiency, and wherein the optical receiver (Rx) comprises:
- a photo diode (PD) for transforming a transmitted optical signal into an electrical signal:
- a first band pass filter (BPF) for passing only a spectrum range which corresponds to a component of the transmitted signal;
- and
- a decoder for transforming the modulation format passed the first BPF into original data.
Dependencies are inferred from the claim text.