Title:
光波長可変フィルタの制御方法および制御装置
Document Type and Number:
Japanese Patent JP4047004
Kind Code:
B2
Abstract:
The present invention aims at providing a control method and a control apparatus for controlling variable selected wavelengths at respective stages with high accuracy and reliability, to obtain desired wavelength characteristics, in a multi-staged band rejection type optical wavelength variable filter. To this end, the optical wavelength variable filter in the present invention has wavelength characteristics formed with a blocking band including a wavelength width according to a deviation amount obtained by deviating respective selected wavelengths from one another of a plurality of optical filter sections that are cascade connected, and the control apparatus for controlling the wavelength characteristics of this optical wavelength variable filter comprises a dropped light monitoring section that takes out to monitor a dropped light to be blocked from passing through at the optical filter section corresponding to the selected wavelength most closest to the center wavelength of the blocking band, among the plurality of selected wavelengths; and a selected wavelength controlling section that adjusts the respective selected wavelengths based on a peak wavelength of the dropped light.
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Inventors:
Nakazawa Tadao
Hideyuki Miyata
Hideyuki Miyata
Application Number:
JP2001399241A
Publication Date:
February 13, 2008
Filing Date:
December 28, 2001
Export Citation:
Assignee:
富士通株式会社
International Classes:
G02F1/125; H04J14/02; G02F1/11
Domestic Patent References:
| JP2000241782A | ||||
| JP8101363A | ||||
| JP2001228451A | ||||
| JP2000035554A | ||||
| JP2000111855A | ||||
| JP11507738A | ||||
| JP2000275442A |
Attorney, Agent or Firm:
Tomijio Sasashima