| 摘要 |
A dispersion compensating module which can compensate the chromatic dispersion of an optical transmission line and which suppresses wavelength distortions ascribable to nonlinear phenomena, is provided. Signal light inputted from a light input portion (19 in FIG. 1) is caused to enter the nonlinear medium (3) of phase conjugate wave generation means (15) by passing it through a light input waveguide (2), a beam splitter (22) and a light input/output waveguide (18) in succession. The nonlinear medium (3) is pumped by pumping light emitted from a pump LD (4), thereby to generate a phase conjugate wave. The generated phase conjugate wave is passed through the light input/output waveguide (18), is reflected by the beam splitter (22) and is passed through a light output waveguide (6) so as to be outputted from a light output portion (20). The light input waveguide (2) is provided with a first isolator (7) which restrains any light from retroceding onto the input side of the signal light. Besides, the light output waveguide (6) is provided with a second isolator (8) which restrains any light from retroceding onto the side of the phase conjugate wave generation means (15). Preferably, the dispersion contribution of the first isolator (7) and that of the second isolator (8) are substantially equalized.
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