| 摘要 |
<p>An optical filter device comprises an active region (100) having an amplifying function, another active region (300) having a noise absorbing function, and a distributed feedback region (200) having a wavelength selecting function. In the optical filter device, a phase shift degree is varied by injecting electric current into the distributed feedback region so that a predetermined wavelength of an optical signal can be selected from wavelength multiplexed signals of as much as sixty or seventy channels.</p> |
