Patent ID: 8442400

Claim:
A wavelength-division multiplexing passive optical network capable of high-bandwidth transmission for optical signals comprising: 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) (OLT 1 to OLTn) respectively connected to the first AWG; a second AWG being positioned at a remote node (RN) and having n-numbered output ports; n-numbered optical transceivers (TRx) (ONT 1 to ONTn) being positioned at subscribers (ONT) and respectively connected to the second AWG; a single mode fiber (SMF) being used for transmission of signals transmitted through the first AWG and the second AWG; and n-numbered SMFs for separate transmission being connected between the second AWG and the n-numbered optical transceivers (TRx) (ONT 1 to ONTn), wherein each of the n-numbered optical transceivers (TRx) (OLT 1 to OLTn) at the OLT and each of the n-numbered optical transceivers (TRx) (ONT 1 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 low noise optical light source having a low noise characteristic at a specific frequency range as compared to a noise characteristic outside of the specific frequency range, wherein the relative intensity noise (RIN) at the specific frequency range is at or below −120 dB/Hz, the low noise optical light source operating at a plurality of driving currents; a driver for modulating the low noise light source at the specific frequency range; 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.