Patent ID: 11885677
Assignee: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
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.