Ultralow-crosstalk and high-resolution integrated Echelle grating as interrogator for FBG sensing
Abstract
A silica-based planar echelle grating (PEG) with high resolution and ultra-low crosstalk is designed, fabricated, and characterized for an integrated spectrometer optimized for C-band operation. By leveraging mature silica waveguide fabrication technology and a large Rowland circle, the PEG exhibits both excellent robustness and superior optical performance. The experimental results demonstrate lowest on-chip loss of 0.9 dB across 14 output channels, with an average inter-channel crosstalk of -45 dB. The device further achieves a narrow 3-dB bandwidth of 0.24 nm, corresponding to a resolving power exceeding 6000, together with a highly accurate realization of the designed 1.5 nm channel spacing. These results highlight silica PEGs as robust, high-performance candidates for wavelength-division multiplexers in fiber-optic communication networks and as spectroscopy interrogators in fiber Bragg grating sensing systems for the precise determination of wavelength shifts.
Details
- Organisation(s)
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Photonics - Optical Analytics, Sensing and Spectroscopy
- External Organisation(s)
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Dalian University of Technology
University of Potsdam
Eindhoven University of Technology (TU/e)
Beijing University of Posts and Telecommunications
Leibniz Institute for Astrophysics Potsdam (AIP)
- Type
- Article
- Journal
- IEEE photonics technology letters
- Volume
- 38
- Pages
- 1106-1109
- No. of pages
- 4
- ISSN
- 1041-1135
- Publication date
- 01.08.2026
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering
- Electronic version(s)
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https://doi.org/10.1109/LPT.2026.3661841 (Access:
Closed
)
