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To provide higher bit rate services to users economically, we proposed the Subcarrier Digital Modulation Passive Optical Network (SDM-PON). SDM-PON has biased and clipped signal sending schemes. The biased signal sending scheme creates a completely positive signal by adding a direct current (DC) to the electrical modulated subcarrier, and then converts it into an optical signal. The clipped signal...
To economically provide higher bit rate services to users, we previously proposed a Subcarrier Digital Modulation Based Passive Optical Network (SDM-PON), and showed the feasibility of a 16-QAM SDM-PON using a bias signal sending scheme. We next proposed a clipped signal sending scheme for SDM-PON to decrease sending power, and three methods for regenerating an original QAM signal from the clipped...
To economically provide higher bit rate services to users, we previously proposed the Subcarrier Digital Modulation based Passive Optical Network (SDM-PON). We also showed the feasibility of a 16-QAM SDM-PON that constantly provides the service data rate of 1 Gbps to each user, in which ONU biases the QAM signal higher so that it is entirely positive before converting into an optical signal (bias...
The authors present the results obtained with a densely spaced FDM coherent optical network using monolithic widely frequency-tunable lasers. The system consists of four channels transmitted around 1.53 mu m, FSK-modulated at 200 Mbit/s and spaced by 2.45 GHz. A 16*16 fibre star coupler combines the four optical signals. Demultiplexing is performed by a heterodyne FM receiver at an IF frequency of...
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