The passive type optical member net of the wavelength division multiplex whose high-speed light information transmission is possible making use of the transmission format which has high spectrum efficiency

摘要

This invention regards the passive type optical member net of the wavelength division multiplex whose high-speed light information transmission is possible making use of the transmission format which had high spectrum efficiency. N where the passive type optical member net of the wavelength division multiplex where the high-speed light information transmission relating to this invention is possible is located, is located, central telephone exchange (OLT) the 1st wave guide arrangement lattice to which n has the number of output ports (AWG) with, n which is connected to the description above 1AWG respectively the optical transceiver (TRx) (OLT1 - OLTn) with, the remote node (Remote Node) the 2nd wave guide arrangement lattice to which n has the number of output ports (AWG) with, the member (ONT) is located on side, connects to the description above 2AWG respectively lightThe transceiver (TRx) (ONT1 - ONTn) with, through the description above 1AWG and the description above 2AWG, the single mode optical fiber which is used for the transmission of the signal which was transmitted (SMF) with, the description above 2AWG and the description above n the optical transceiver (TRx) (ONT1 - ONTn) with n which is connected between the single mode optical fiber for individual transmission (SMF) with, to have, the aforementioned central telephone exchange (OLT) the optical transceiver side (TRx) (OLT1 - OLTn) and the aforementioned member (ONT) the optical transceiver side (TRx) (ONT1 - ONTn), the respective description aboveThrough 1AWG and the description above 2AWG, it is connected by the WDM filter and the aforementioned WDM filter where the light which is separated is input, among the sending and receiving illuminants of the wave length zone which differs mutually, the optical transmitter which transmits the light information (Tx) with, it is connected by the aforementioned WDM filter, among the sending and receiving illuminants of the wave length zone which differs mutually, the optical receiver which receives the light information (Rx) with, it has, the aforementioned optical transmitter (Tx), it is low the noise whose noise is little low the noise whose noise is little in the specific frequency domain illuminant (low noise optical source) with, in the aforementioned specific frequency domain illuminantThe photodiode which converts the light information where the electric current drive circuit in order to modulate (Driver) with, it was connected by the aforementioned electric current drive circuit, the encoder which is converted to the transmission format which had high spectrum efficiency (Encoder) with, had the data which is transmitted, the aforementioned optical receiver (Rx), was transmitted to the electric information (PD) with, the 1st band pass filter which makes only the spectrum territory pass which corresponds to the light information component which was transmitted (BPF) with, the decoder which converts aforementioned transmission format which passes the description above 1BPF, to the original data (Decoder) with, having featureIt does.