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

Claim 13:
14. A spectrometer comprising:
a beam splitter to split incident light into a first portion and a second portion;
a delay stage, in optical communication with a first output of the beam splitter and 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, to delay the first portion with respect to the second portion;
a reference waveguide, in optical communication with a second output of the beam splitter, to guide the second portion;
an attenuator, in optical communication with at least one of the delay stage and the reference waveguide, to attenuate at least one of the first portion or the second portion;
a detector, in optical communication, via the attenuator, with the delay stage and the reference waveguide, to detect interference of the first portion with the second portion;
a processor, operably coupled to the detector, to determine a spectrum of the incident light based on the interference of the first portion and the second portion; and
a phase modulator, in optical communication with the beam splitter, to modulate a relative phase between the first portion and the second portion such that interference of the first portion with the second portion creates a null at a desired frequency.