Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
195 words
A method of manufacturing an optical filter to be used in an optical amplifier equipped with an erbium-doped fiber that is excited by an pump light source, in a wavelength division multiplex transmission system comprising the steps of: setting the input signal light power of the optical amplifier, output power of the pump light source, and output signal light power of the optical amplifier respectively, to power values used during operation in a communication system and setting the total power of a plurality of test input light, which includes simulation input light of a plurality of wavelengths and input light of one of the wavelengths in the communication band of the wavelength division multiplex transmission system, equal to the total power of communication input signals of a plurality of wavelengths used in the wavelength division multiplex transmission system, obtaining an attenuation amount in one-to-one correspondence to the respective wavelengths of the specified bands in a wavelength multiplex transmission band so that the output power goes into the setting power values; and setting a loss spectrum to become a loss spectrum of the attenuation amount in one-to-one correspondence to the respective wavelengths of the communication band.
Claim 2
Independent Claim
195 words
A method of manufacturing an optical filter to be used in an optical amplifier equipped with an erbium-doped fiber that is excited by an pump light source, in a wavelength division multiplex transmission system comprising the steps of: setting the input signal light power of the optical amplifier, output power of the pump light source, and output signal light power of the optical amplifier respectively, to power values used during operation in a communication system and setting the total power of a plurality of test input light, which includes simulation input light of a plurality of wavelengths and input light of one of the wavelengths in the communication band of the wavelength division multiplex transmission system, equal to the total power of communication input signals of a plurality of wavelengths used in the wavelength division multiplex transmission system, obtaining an attenuation amount in one-to-one correspondence to the respective wavelengths of the specified bands in a wavelength multiplex transmission band so that the output power goes into the setting power values; and setting a loss spectrum to become a loss spectrum of the attenuation amount in one-to-one correspondence to the respective wavelengths of the communication band.
Claim 3
Dependent Claim
12 words
An optical filter manufactured by the manufacturing method of claim 1 .
Claim 4
Dependent Claim
38 words
An optical amplifier for wavelength division multiplex communication which uses an erbium-doped fiber excited by an pumping light source, wherein the optical filter of claim 2 is inserted in the light path that passes through the erbium-doped fiber.
Claim 5
Dependent Claim
46 words
An optical amplifier for wavelength division multiplex communication systems which uses an erbium-doped fiber excited by an pumping light source, wherein a single-mode optical fiber is connected to the erbium-doped optical fiber and the optical filter of claim 2 is inserted in this single-mode optical fiber.
Claim 6
Dependent Claim
30 words
A method for manufacturing an optical filter as set fourth in claim 1 , wherein the respective power values of the test input light signals are equal to each other.
Claim 7
Dependent Claim
33 words
A method for manufacturing an optical filter as set fourth in claim 1 , wherein a number of test input light signals is equal to the number of using light signals in transmission.
Claim 8
Dependent Claim
32 words
A method for manufacturing an optical filter as set in claim 5 , wherein a number of test input light signals is equal to the number of using light signals in transmission.
Claim 9
Dependent Claim
26 words
A method for manufacturing an optical filter as set in claim 1 , wherein the test input light has an oscillation spectrum in a wide band.