All-fiber noninterferometric narrow-transmission-bandpass filter

D. Sáez-Rodríguez*, J.L. Cruz, A. Díez, M.V. Andrés

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In-fiber mode engineering based on the combination of Bragg and long-period gratings (LPGs) permits the implementation of noninterferometric transmission filters with narrow passbands using standard single-mode fiber. The design of the bandpass filter is based on the coupling between propagating and counterpropagating cladding modes in two fiber Bragg gratings. A LPG located between the Bragg gratings transfers power from the input fundamental mode to a specific cladding mode and recouples the filtered signal to the output fundamental mode. The filter produces a series of narrow passbands of about 30 pm linewidth with a maximum transmittance above 60%, 20 dB isolation, and passband separation of about 1 nm, each corresponding to the contribution of a different cladding mode.

Original languageEnglish
Pages (from-to)4314-4316
Number of pages3
JournalOptics Letters
Issue number20
Early online date10 Sept 2012
Publication statusPublished - 15 Oct 2012


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