| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical time division multiplexer exhibiting higher precision than a conventional one and performing automatic phase control more easily, and also to provide an optical time division multiplexing method. <P>SOLUTION: A continuous light source 110 generates reference continuous light having a second carrier wavelength λm different from a first carrier wavelength λs, i.e. the carrier wavelength of input pulse light. An optical multiplexing section 120 produces input light containing a pulse component and a continuous component by multiplexing the input pulse light and the reference continuous light. An optical branch section 130 forms first to 2<SP>p</SP>-th input signals by branching the input light by 2<SP>p</SP>. A modulating section 140 produces a q-th modulation signal of NRZ signal by driving the continuous component of the q-th input signal with an intensity control signal of bit rate B to impart a time difference of T/2<SP>p</SP>(s), respectively, between the first to 2<SP>p</SP>-th modulation signals. A multiplexing section 150 multiplexes the first to 2<SP>p</SP>-th modulation signals in p steps to output a p step multiplex signal of bit rate 2<SP>p</SP>B and outputs a phase control reference signal. An intensity measuring section 160 measures intensity of the continuous component of second wavelength λm of the reference signal and sends it to a modulation control section 170. The modulation control section 170 sends a feedback control signal to the modulating section 140 depending on the measured intensity and performs phase control of the modulation signal. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
