Patent ID: 6362476
Filing Date: 2002-03-26
Classification: G01J

Abstract:
An arrangement for measuring the wavelength linearity of an optical spectrum analyzer, the optical spectrum analyzer including a diffraction grating and resolution bandwidth filter, the resolution bandwidth filter exhibiting a linear skirt slope expressed as a percentage/pm, the arrangement comprisinga wavelength source for supplying an input optical signal at a predetermined wavelength; a wavelength meter for measuring the wavelength of the applied input optical signal; an optical splitter for dividing the input optical signal from the wavelength source between the wavelength meter and an input of the optical spectrum analyzer; and an optical power meter coupled to the optical signal output from said optical spectrum analyzer, said optical power meter for recording insertion loss associated with the combination of the optical spectrum analyzer and the optical power meter, and determining an optical wavelength offset at each wavelength across the range of the optical spectrum analyzer by subtracting a predetermined 3 dB amplitude from a recorded amplitude at each wavelength and dividing the difference by the skirt slope value.