| 摘要 |
The present invention relates to an optical filter and the like, applicable to a gain equalizer for equalizing the gain of an optical amplifier as well, comprising a structure enabling a repeater and the like to have a small-sized, inexpensive configuration This optical filter 22 has such a transmission spectrum that a ripple of 1 dB or more exists with respect to light in a communication wavelength band This transmission spectrum is designed so as to yield a transmissivity of -10 dB or less in both of a first blocking wavelength band having a bandwidth of 20 nm or more located on the shorter wavelength side than the communication wavelength band, and a second blocking wavelength band having a bandwidth of 20 nm or more located on the longer wavelength side than the communication wavelength band The optical filter having such a transmission spectrum can function as a filter for blocking noise light and as a gain equalizer
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