CPC G01J 3/0256 (2013.01) [G01J 3/0205 (2013.01); G01J 3/0213 (2013.01); G01J 3/45 (2013.01); G01J 3/4531 (2013.01); G01J 3/4532 (2013.01); G02F 1/212 (2021.01)] | 18 Claims |
1. A method of operating a spectrometer, the method comprising:
splitting incident light into a first portion and a second portion;
transmitting the first portion through at least one delay stage switchable between a first waveguide having a first optical path length and a second waveguide have a second optical path length different than the first optical path length;
transmitting the second portion through a reference waveguide;
attenuating at least one of the first portion or the second portion to compensate for loss imbalance between the at least one delay stage and the reference waveguide;
detecting interference between the first portion with the second portion; and
determining a spectrum of the incident light based on the interference of the first portion and the second portion,
wherein attenuating the first portion comprises modulating a relative phase between the first portion and the second portion such that the interference of the first portion with the second portion has a null at a desired frequency.
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