Draw tower grating (DTG) with large capacity, long distance, fast response and other advantages is rapidly becoming the current mainstream fiber optic sensors, but want to write high reflectivity fiber on the draw tower fiber is particularly difficult. Therefore, it is important to further study the grating formation mechanism of fiber gratings for the rapid preparation and wide application of DTG. We will four different types of pure silicon dioxide optical fiber core fiber and G654E bend-resistant fiber for multi-pulse writing experiments. In pure SiO2, due to the lack of oxygen conditions Si-O-Si structure in the middle of the position of the oxygen atom will produce neutral oxygen vacancies, when the capture of a positively charged hole will form a SiE' color centred, while the experimental results of two pure dioxide optical fiber and can not be inscribed out of the grating, indicating that defects in the optical fiber is not a defect in the color centred is not a necessary condition for the formation of optical fiber into the grating. In order to further investigate the role of the color centred on the refractive index modulation of optical fibers, the above fiber for high-pressure hydrogen-carrying experiments, the hydrogen-carrying fiber for the multi-pulse writing experiments, found that there is still a pure dioxide optical fiber can not be written into the grating, and the remaining four types of optical fiber emissivity have a greater increase, to verify that the color centred model of the refractive index modulation of optical fibers is not a direct contribution to the indirect.
We investigate the photon statistics of two-mode photon-subtracted squeezed vacuum states (TMPSSV), which are important factors to affect the sensitivity and resolution of optical interferometers. The comparison between the photon statistics of TMPSSV and two-mode squeezed vacuum states (TMSV) shows that the non-Gaussian operation has the effect of narrowing the characteristic widths of photon number probability distributions. Different from the super-Poissonian statistical distribution of TMSV, when the initial squeezing parameter is lower, TMPSSV shows a sub-Poissonian statistical distribution which is desirable for enhancing the sensitivity and resolution of interferometers. Therefore, non-Gaussian entanglement based on TMPSSV provides a promising quantum resource for an ultra-sensitivity and super-resolution optical interferometer far beyond the standard quantum limit.
In this study, we developed a twisted optical fiber surface plasma resonance (SPR) refractive index sensor using the helical structure of a dual side-hole fiber (DSHF) to measure refractive index sensitivity. The sensor structure consists of the helical DSHF integrated into a single-mode fiber (SMF) and a multimode fiber (MMF). Our experimental findings demonstrate that the twisted SPR refractive index sensor based on the helical DSHF exhibits excellent responsiveness within the refractive index range of 1.33 to 1.38, with a sensitivity of 1998.09 nm/RIU and a high linear correlation coefficient of 0.9571. This helical DSHF design offers numerous advantages, including high sensitivity, remarkable linearity, a wide measurement range, and ease of manufacturing.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.