6533b829fe1ef96bd128a60b
RESEARCH PRODUCT
All-fiber noninterferometric narrow-transmission-bandpass filter
D. Saez-rodriguezJose Luis CruzMiguel V. AndrésAntonio Diezsubject
PHOSFOSMode volumeMaterials sciencebusiness.industryPhysics::OpticsLong-period fiber gratingCladding modeCladding (fiber optics)Atomic and Molecular Physics and OpticsOpticsFiber Bragg gratingPlastic optical fiberbusinessPassbanddescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-10-12 |