A spatial optical filter based on splice misalignment between optical fibers with different diameters is proposed for gas refractometry. The sensing head is formed by a 2 mm long optical fiber with 50 μm diameter that is spliced with a strong misalignment between two single-mode fibers (SMF28) and interrogated in transmission. The misalignment causes a Fabry–Perot behavior along the reduced-size fiber and depending on the lead-out SMF28 position, it is possible to obtain different spectral responses, namely, bandpass or band-rejection filters. It is shown that the spatial filter device is highly sensitive to refractive index changes on a nitrogen environment by means of the gas pressure variation. A maximum sensitivity of $-1390\mathrm{nm}/\mathrm{RIU}$ for the bandpass filter was achieved. Both devices have shown similar temperature responses with an average sensitivity of $25.7\mathrm{pm}/°\mathrm{C}$.

© 2012 Optical Society of America

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

Multimedia

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

Related Journal Articles

• Fiber-optic extrinsic Fabry–Perot interferometer sensors with three-wavelength digital phase demodulation (OL)
• Temperature Desensitization of a Fiber-Optic Pressure Sensor by Simultaneous Measurement of Pressure and Temperature (AO)
• Interferometric Optical Time-Domain Reflectometry for Distributed Optical-Fiber Sensing (AO)
• Investigation of Interferometric Noise in Fiber-Optic Bragg Grating Sensors by Use of Tunable Laser Sources (AO)
• Mach–Zehnder and Modified Sagnac-Distributed Fiber-Optic Impact Sensor (AO)

Related Conference Papers

• Ultra Resolution Fiber Sensor Using a Pre-Stabilized Diode Laser
• Ultra-Sensitive Dynamic Strain Detection by Phase-Sensitive Laser Frequency Locking to a Passive Bragg Grating Resonator
• Ultra-High Sensitivity Curvature Sensor Based on Bragg Grating Defined Interferometric Cavities Formed in Multicore Fiber
• Laser Noise-Limited Ultra-High Performance Remote Sensing with a Fiber-Fabry-Perot
• Speed Measurement of a Liquid Using a Capillary Optical Fibre Sensor