Wavelength-order-dependent phase-noise degradation from short-wavelength loss in cascaded WDM interferometric FBG arrays.

Authors

Jiali Gao, Lina Ma, Yu Shen, Qilin Hong, Qihao Hu, Xinpeng Jiang, Qiong Yao

Published in

Optics letters. Volume 51. Issue 17. Pages 4829-4831. Sep 01, 2026.

Abstract

Point-by-point femtosecond-written fiber Bragg gratings (FBGs) exhibit Mie-scattering-induced short-wavelength loss. Its array-level noise consequences in cascaded wavelength-division-multiplexed (WDM) interferometric arrays remain unclear. We show that this device-level loss causes wavelength-order-dependent phase-noise degradation. Reversing the long- and short-wavelength FBG order gives an 18.5 dB short-wavelength-channel noise-floor difference at 1 kHz. The penalty increases as return power decreases and as more long-wavelength FBGs are placed upstream, identifying wavelength order as a key design parameter.

PMID:
42679257
Bibliographic data and abstract were imported from PubMed on 02 Sep 2026.

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