Title:
OPTICAL FILTER, PROCESS FOR PRODUCING THE SAME, AND OPTICAL AMPLIFIER PROVIDED WITH THE SAME
Document Type and Number:
WIPO Patent Application WO/1997/040559
Kind Code:
A1
Abstract:
A process for producing an optical filter of which the dependence of the gain on the wavelength is suppressed. The light power of the input signal of an optical amplifier (4) and the output power and the light power of the output signal of a pumping source (8) are set at the power used at the time of communication, and the total power of the pseudo input light of a plurality of wavelengths ('lambda'1, 'lambda'2, ..., 'lambda'n) from light sources (1a) and the input light (probe light) of one of the wavelengths of a communication band from a light source (1m) is set at the total power of communication input signals of a plurality of a wavelengths at the time of wavelength multiplexing communication. Then the attenuation of the input light corresponding to the wavelength of the probe light is found by inputting the input light to the amplifier (4) in the set state and variably adjusting the attenuation during transmission from the light source (1m) to the input terminal (14) of the amplifier (4) so that the output power of the probe light from the amplifier (4) can fall within a range from the maximum output power of the pseudo output power to the minimum output power of the output power. By repeating the above-mentioned operation while changing the wavelength of the probe light, the loss spectrum of the attenuation corresponding to each wavelength one to one is set to the optical filter.
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Inventors:
FUKUSHIMA MASARU (JP)
OGOSHI HARUKI (JP)
NIMURA HIJIRI (JP)
OGOSHI HARUKI (JP)
NIMURA HIJIRI (JP)
Application Number:
PCT/JP1997/001431
Publication Date:
October 30, 1997
Filing Date:
April 24, 1997
Export Citation:
Assignee:
FURUKAWA ELECTRIC CO LTD (JP)
FUKUSHIMA MASARU (JP)
OGOSHI HARUKI (JP)
NIMURA HIJIRI (JP)
FUKUSHIMA MASARU (JP)
OGOSHI HARUKI (JP)
NIMURA HIJIRI (JP)
International Classes:
G02B6/00; G02F1/35; H01S3/10; H04B10/07; H04B10/2507; H04B10/29; H04B10/294; (IPC1-7): H01S3/10; H04B10/17
Foreign References:
| JPH04147114A | 1992-05-20 | |||
| JPH0675254A | 1994-03-18 |
Other References:
TACHIBANA M., ET AL.: "ERBIUM-DOPED FIBER AMPLIFIER WITH FLATTENED GAIN SPECTRUM.", IEEE PHOTONICS TECHNOLOGY LETTERS., IEEE SERVICE CENTER, PISCATAWAY, NJ., US, vol. 03., no. 02., 1 February 1991 (1991-02-01), US, pages 118 - 120., XP000203005, ISSN: 1041-1135, DOI: 10.1109/68.76860
See also references of EP 0836254A4
See also references of EP 0836254A4
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