| 摘要 |
PURPOSE: A WDM(Wavelength Division Multiplexed) light source and a passive optical network system using a light source are provided to adopt a spectrum division method without a wavelength stabilizing circuit for stabilizing a light source having a specific oscillating wavelength, and to supply a WDM signal having a very narrow line width, thereby supplying a broadcasting service without signal distortion. CONSTITUTION: The first optical amplifier(30) operates by being pumped on a rear side with a pump laser(10), and generates a natural radiation amplifying noise. A multiplexer/demultiplexer(50) has one input/output end on one side and plural input/output ends on the other side, demultiplexes a signal to output the signal to the input/output ends of the other side, multiplexes signals, and outputs the multiplexed signals to the input/output end of the one side. Mirrors(55) re-input the demultiplexed signals outputted through the plural input/output ends to the plural input/output ends. A circulator(40) transmits a signal inputted from the amplifier(30) to the one input/output end, and outputs the multiplexed signal inputted from the one input/output end. The second optical amplifier(70) amplifies the multiplexed signal. An optical distributor(80) distributes the amplified signal, outputs a portion of the signal to the amplifier(30), and outputs a portion of the signal outside. An outer modulator(90) modulates the multiplexed signal, and outputs the modulated signal.
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