| 摘要 |
PURPOSE:To suppress timing jitter caused by a Gordon house effect by inverting on/off of a bright soliton optical signal and generating an inverted optical signal providing a phase difference being a dark soliton condition to a phase of a light. CONSTITUTION:A soliton pulse light source 101 generates a pulse train, it is branched into four by a photocoupler 103, optical delay circuits 104-107 delay respectively each pulse trains to be deviated by 0, 25, 50, 75 ps relatively and respectively and luminous intensity modulators 108-111 apply digital modulation to the pulse train. The polarized wave state of each of the 4 systems is set to be identical by polarized wave controllers 128a, b, c, d. Optical signals are synthesized by a photocoupler 112 and a bright soliton optical signal subjected to four multiplexing is generated. When a time division multiplex optical signal is made incident onto a port P1 of an EXOR optical gate 3 and an output light of a CW laser 2 is made incident onto a port P2, the optical signal is converted into an EXORed outputs of the both, that is, the optical signal resulting from inverting on/off of the bright soliton optical signal and it is outputted from a port P3. The phase is shifted by a pi radian in the middle of a notch of a dark pulse optical signal through the modulation of an optical phase modulator 4 to obtain a dark soliton signal transmission optical signal. |
