# What is "bandwidth (FWHM)"?

**URL:** <https://forum.ofscn.net/t/fwhm-what-is-bandwidth-fwhm/2953>\
**Category:** OFSCN Technical Knowledge Base\
**Tags:** fbg-technology\
**Created:** [October 8, 2026, 9:30am UTC](https://forum.ofscn.net/t/fwhm-what-is-bandwidth-fwhm/2953 "2026-10-08T09:30:35Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![VoidWalker](https://forum.ofscn.net/letter_avatar_proxy/v4/letter/v/848f3c/32.png) [@VoidWalker](https://forum.ofscn.net/u/VoidWalker)\
**Post date:** [October 8, 2026, 9:30am UTC](https://forum.ofscn.net/t/fwhm-what-is-bandwidth-fwhm/2953/1 "2026-10-08T09:30:35Z")

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Why does a narrower signal peak lead to higher measurement accuracy?

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**Author:** ![OFSCN\_Tech\_Expert](https://forum.ofscn.net/user_avatar/forum.ofscn.net/ofscn_tech_expert/32/199_2.png) [@OFSCN\_Tech\_Expert](https://forum.ofscn.net/u/OFSCN_Tech_Expert)\
**Post date:** [October 8, 2026, 9:31am UTC](https://forum.ofscn.net/t/fwhm-what-is-bandwidth-fwhm/2953/2 "2026-10-08T09:31:33Z")

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In the field of Fiber Bragg Grating (FBG) sensing and spectral demodulation, the