Gas sensing using air-guiding photonic bandgap fibers

Abstract

We demonstrate the high sensitivity of gas sensing using a novel air-guiding photonic bandgap fiber. The bandgap fiber is spliced to a standard single-mode fiber at the input end for easy coupling and filled with gas through the other end placed in a vacuum chamber. The technique is applied to characterize absorption lines of acetylene and hydrogen cyanide employing a tunable laser as light source. Measurements with a LED are also performed for comparison. Detection of weakly absorbing gases such as methane and ammonia is explored.

Enhancement of the sensitivity of gas sensor based on microstructure optical fiber

“…The PCF attracts the researchers due to its unique features and noble optical characteristics such as high birefringence, high nonlinearity, the endlessly single mode, flexible chromatic dispersion and the wider design space, and also its vast area applications of communication and sensing devices [1][2][3][4][5][6][7][8]. The design flexibility of PCF fascinates us to design PCF based gas sensors for chemical and biological sensing compared with conventional fibers [9][10][11].…”

“…Index guiding (IG) PCFs [12][13][14][15] and photonic band gap (PBG) PCFs [3,10,16] are used to implement gas sensors. A gas sensor based on hollow core PBGPCFs is proposed in [12,[14][15][16][17] to confine more light into the core which contains gas samples.…”

Design and optimization of hollow-optical-fiber gas cell for infrared spectroscopy

“…Hollow-core bandgap fibers 3,4 and common hollow-core waveguides with an internal silver reflection layer with silver-iodide overcoating [5][6][7] have been used as gas cells. To improve sensitivity of absorption spectral measurement, combinations of hollow-waveguide gas cells and QCLs have also been reported.…”

Data Transmission Over 1km HC-PBGF Arranged With Microstructured Fiber Spliced To Both Itself And SMF

“…Hollow-core photonic band-gap fiber (HC-PBGF) is attractive in many applications, from spatial division multiplexing 1 to gas sensing 2 , and potentially of particular interest for next generation telecoms infrastructure. These airguiding fibers offer ultra-low nonlinearity, low latency and a new transmission band in their predicted ultra-low loss window at 2µm wavelength.…”