Title:
OPTICAL SIGNAL PROCESSING CIRCUIT
Document Type and Number:
Japanese Patent JP3201560
Kind Code:
B2
Abstract:
PURPOSE: To realize an optical equalizer which compensates dispersion of optical fibers and the array waveguide diffraction gratings having flat optical frequency characteristics with each of respective channels by specifying the parameters of array waveguide diffraction grantings.
CONSTITUTION: Signal light of a frequency (f) (wavelength λ=c/f) is spread by diffraction in the first sectional slab waveguide 22 and is introduced to the channel waveguide array 23 arranged perpendicularly to its diffraction plane when this signal light is made incident on the central part of the channel waveguide 11 for input. At this time, the quantity of the light power to be taken into the respective waveguides of the channel waveguide array 23 depends upon the core opening widths D1 of the respective waveguides. The core opening widths D of the respective waveguides of the channel waveguide array 23 are set at prescribed values at the boundary of the first sectional slab waveguide 22 and the channel waveguide array 23, by which the photoelectric amplitude Bit(n+1) of the (n+1)th (n=0 to N-1) is assigned and the prescribed waveguide length Q(n+1) at about the wavelength λ of below of the light is adjusted.
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Inventors:
Katsunari Okamoto
Hiroo Yamada
Hiroo Yamada
Application Number:
JP13063294A
Publication Date:
August 20, 2001
Filing Date:
June 13, 1994
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G02B6/12; H04B10/2513; H04B10/27; H04B10/29; (IPC1-7): G02B6/12
Other References:
【文献】米国特許5136671(US,A)
Attorney, Agent or Firm:
Furuya Fumio