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Light having a predetermined wavelength band as issued from a light-emitting diode is launched into a gas absorption cell which is filled with a gas having a plurality of absorption spectra. The light launched into the cell has a plurality of wavelengths absorbed by the gas. The absorption wavelengt

Light having a predetermined wavelength band as issued from a light-emitting diode is launched into a gas absorption cell which is filled with a gas having a plurality of absorption spectra. The light launched into the cell has a plurality of wavelengths absorbed by the gas. The absorption wavelengths are known and their values are preset in a memory in an optical spectrum analyzing section 58. The light passing through the cell is launched into the optical spectrum analyzing section 58, where it receives arithmetic operations to produce an optical spectrum. The optical spectrum analyzing section 58 has a CPU which compares a plurality of wavelengths having dominant absorption in the obtained optical spectrum with the preset reference wavelengths to compute the errors in wavelength measurement. The calibration value is determined on the basis of the average of these errors and the optical spectrum analyzer is accordingly calibrated in wavelength.

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1. A method for calibrating an optical spectrum analyzer in wavelength, said method comprising the steps of:passing a light from a light source emitting light in a predetermined wavelength band through a gas absorption cell to absorb light at specified wavelengths; determining wavelengths having dom

1. A method for calibrating an optical spectrum analyzer in wavelength, said method comprising the steps of:passing a light from a light source emitting light in a predetermined wavelength band through a gas absorption cell to absorb light at specified wavelengths; determining wavelengths having dominant absorption; detecting the difference between a resulting measurement of each of the wavelengths having dominant absorption and a corresponding preset reference value; calculating the average of the detected differences; and performing calibration in wavelength on the basis of said average.