Optoelectronic device for multimode demultiplexing spectrometer and spectral reconstruction method

By designing optoelectronic devices for a multimode demultiplexing spectrometer and employing SOI technology and machine learning algorithms, mode demultiplexing and spectral reconstruction were achieved. This solved the problems of increased number of optoelectronic devices and optical circuit complexity in existing technologies, and promoted the miniaturization and integration of spectrometers.

CN115683335BActive Publication Date: 2026-01-06XIAMEN UNIV
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Patent Information

Application Number
CN202211331416.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-10-28
Publication Date
2026-01-06
Estimated Expiration
2042-10-28

AI Technical Summary

Technical Problem

The lack of optoelectronic devices in the current technology that can simultaneously realize mode demultiplexing and spectral measurement leads to an increase in the number of optoelectronic devices and the complexity of optical circuits in MDM systems, which hinders the miniaturization and integration of spectrometers in the MDM field. At the same time, traditional spectral reconstruction algorithms are difficult to handle nonlinear spectral relationships.

Method used

Design an optoelectronic device for a multimode demultiplexing spectrometer. The device uses a cascaded photodetector structure fabricated by SOI process, combined with a two-dimensional material absorber and a metal electrode, to achieve mode demultiplexing and spectral reconstruction functions. The spectral reconstruction is performed using machine learning algorithms.

Benefits of technology

Three spectral reconstruction modes were implemented: single-mode spectral reconstruction, single-sample multi-mode reconstruction, and multi-sample resolution-enhanced reconstruction, which reduced the complexity of the wavelength division-mode division hybrid multiplexing system and promoted the miniaturization and on-chip integration of the spectrometer.

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Abstract

The photoelectric device of multimode demultiplexing spectrometer and spectral reconstruction method relate to mode division (demultiplexing) spectroscopy. The photoelectric device is composed of a plurality of photoelectric detectors in cascade, each of which includes an SOI substrate, a silicon oxide layer, a multimode waveguide with two side branches, a two-dimensional material absorber and a metal electrode. The spectral reconstruction method includes a single-mode spectral reconstruction method, a single-sample multimode reconstruction algorithm and a multi-sample resolution enhancement reconstruction method. Different spectral information is modulated on different waveguide modes, then input into the multimode demultiplexing spectrometer, and a photocurrent is generated on each photoelectric detector. By using the spectral reconstruction method, single-mode spectral reconstruction under single sample, one-time multimode mixed spectral reconstruction and resolution enhancement spectral reconstruction under multi-sample are realized. The multimode demultiplexing spectrometer can simultaneously realize mode demultiplexing function and spectral detection capability, greatly reducing the complexity of the wavelength-division-mode-division hybrid multiplexing system.
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