Impact of Optical Parameters on Nonlinearity Measurement of Bend Insensitive Fiber – Erratum
0
Citation
4
Reference
10
Related Paper
Abstract:
This paper estimates the nonlinear refractive index of low attenuation bend insensitive fiber through experiments and simulation. We have studied and analysed the impact of all optical parameters such as wavelength difference of dual-frequency input signal, fiber length, effective area and dispersion on nonlinearity measurements of this fiber. In addition, a comparative study has been made between different fiber types with different optical properties to choose the more tolerant fiber against nonlinearity for high power fiber optic communications.Keywords:
Zero-dispersion wavelength
We propose use of a short PM-fiber section as birefringent medium to construct an all-fiber Lyot filter, with bandwidth adjustable through the PM-fiber length. An all-fiber all-normal-dispersion laser is demonstrated using standard components only.
Cite
Citations (0)
Fiber-optic Ccurrent Sensor Using a Long-period Fiber Grating Inscribed on a High Birefringent Fiber
Based on Faraday effect, the variation of current flowing through the conductor can be encoded as that of azimuth angle of light polarization propagating through the fiber coil wound onto the conductor. The amount of current can be obtained by measuring the variation of the light intensity transformed from that of the azimuth angle through a polarization analyzer. In this paper we propose a fiber-optic current sensor system that employs a fiber polarization analyzer as a sensor interrogation device. The fiber polarization analyzer was prepared by inscribing a long-period fiber grating on a high birefringent fiber. At the fixed wavelength of 1522.5 nm, the fabricated fiber device has the polarization extinction ratio of more than 25 dB. The measurement of large current up to 600 Arms was accomplished based on a simple fiber interrogation device and the measurement output of the sensor system showed a good linearity.
Long-period fiber grating
Fiber Bragg Grating
Current sensor
Cite
Citations (0)
The interaction between acoustic wave and the laser light passing through an optical fiber has been studied by several workers.1)-4) The detection of acoustic wave using an optical fiber carried out5)6), also. The receiving sensitivity of optical fiber hydrophone is determined by the rate of change in the optical path length of the sensing fiber with respect to changes in the external pressure on the fiber. These changes in the optical path length are results of the induced changes in index of refraction of the fiber and changes in the length of the fiber. There are the hydrophone of an interference using two optical fibers and a non-interference using a polarization-maintaining optical fiber. In this paper, an ultrasonic sensor using a polarization-maintaining optical fiber based on a. non-interference has been studied.
Hydrophone
Optical path length
Optical path
Fiber Bragg Grating
Cite
Citations (0)
A fiber sensor configuration suitable for simultaneous measurement of temperature and strain is investigated. The sensor consists of a high-birefringence fiber loop mirror concatenating with an erbium-doped fiber. The high-birefringence fiber used in the configuration is capsule shaped polarization maintaining fiber, which serves as the sensor element. While the erbium-doped fiber acts as the temperature compensation module. By monitoring the peak power variation and peak wavelength shift, it is feasible to simultaneously measure temperature and strain. The experimental results show that the mean square errors for temperature and stain are 0.35°C and 13.34με, respectively. The proposed sensor configuration shows several merits, including simple in structure, easy fabrication, low cost and high sensitivity.
Erbium
Fiber Bragg Grating
Cite
Citations (0)
In-fiber optical devices have low insertion loss, high reliability and compatibility with the fiber systems and transmission network. They are different from the in-line components that are typically produced by coupling the light in and out of the optical fiber to and from some bulk or integrated optical waveguide device, therefore, inducing high insertion loss. An in-fiber optical polarizer is a key component for integration of optical fiber system. The fiber grating technology has been vastly developed in the last two decades. It is a mature technique to achieve in-fiber optical components (reflection mirror, dispersion compensator, mode coupler et al.) with simple fabrication process, freely designed operating wavelength and no fiber type limitation. We have reported the 45° tilted fiber grating (45°-TFG) is an ideal in-fiber linear polarizer, which is based on Brewster's law. The polarization extinction ratio achieved by a 48mm long 45° TFG is exceeding 50 dB at the peak value and more than 40 dB over 50nm wavelength range. Compare with the otherin-fiber polarizers technique, such as anisotropic absorption, chiral fiber grating, and polarizing fiber based structures, the 45°-TFG based polarizers have many advantages, such as low cost, simply fabrication process, no limited by the fiber type, arbitrary operation wavelength, high polarization extinction ration, linear polarization state preservation and high handling power. Moreover, by using 45°-TFGs, we can achieved an all-fiberLyot filter (AFLF) - an in-fiber polarization interferometer, an all fiber mode locking fiber laser system, in-fiber power taping device and optical spectrometer.
Fiber Bragg Grating
Polarizer
Long-period fiber grating
Extinction ratio
Cite
Citations (0)
Optical fiber sensors are suitable for measuring almost all magnitudes these days. This article describes one new possible area of optical fiber sensors. These sensors use for their function fundamentals of redistribution of power inside optical fiber. This principle should allow constructing a very sensitive optical fiber sensor. We designed novel optical fiber that affords utilizing of optical fiber for telecommunications and measurement at the same time. This fiber is designed to work on two wavelengths. This fiber works on telecommunication wavelength of 1550 nm in single mode regime and works on measurement wavelength of 850 nm in quasi-single mode regime. The refractive index profiles of real fabricated optical fiber samples and their development are shown in this article as well. All fiber samples were made thanks to grant cooperation with Academy of Science of the Czech Republic. The aim of this article is that brings new approach to utilization of optical fiber as a sensor based on redistribution of optical power among several guided modes and to show novel optical fiber structure design that agrees with conditions for such operations.
Mode volume
Fiber-Optic Communication
Cite
Citations (2)
A novel optofluidically tunable Thulium-doped fiber laser (TDFL) based on a multimode interference (MMI) fiber filter is experimentally demonstrated with a wide tuning range from 1813.52 to 1858.70 nm. The wavelength tuning of the TDFL is achieved by employing an MMI fiber filter which is formed by splicing a segment of a special no-core fiber that is an all silica fiber without fiber core to single mode fibers. The no-core fiber with a large diameter of 200 μm is gradually vertically covered by refractive index matching liquid, which leads to a wavelength tuning of the transmission peak of the MMI fiber filter. The relationship between the refractive index of the refractive index matching liquid and the peak wavelength shift of the MMI fiber filter is also discussed. Using the MMI fiber filter, a Thulium-doped fiber laser with a tuning range of 45.18 nm, a side-mode suppression ratio better than 40 dB, and a 3 dB bandwidth less than 0.16 nm is demonstrated.
Plastic-clad silica fiber
All-silica fiber
Fiber Bragg Grating
Cite
Citations (53)
This paper estimates the nonlinear refractive index of low attenuation bend insensitive fiber through experiments and simulation. We have studied and analysed the impact of all optical parameters such as wavelength difference of dual-frequency input signal, fiber length, effective area and dispersion on nonlinearity measurements of this fiber. In addition, a comparative study has been made between different fiber types with different optical properties to choose the more tolerant fiber against nonlinearity for high power fiber optic communications.
Zero-dispersion wavelength
Cite
Citations (0)
The main objective of this project was to develop the fiber optic transmission coupler, mainly focus on passive optical fiber coupler. Fiber coupling with losses remains a vital part of optical fiber network. An ideal fiber couplers should transfer light with no loss and should have complete insensitivity to the dispersion of light among the fiber cable and the state of polarization of light. In reality, the performance of optical fiber system usually determines by the characteristics of the device. In this project, the losses associated with coupling light from one cable into another was investigated, how coupling losses are affected by end gap distance, and by the amount of angular and lateral misalignment between fiber ends were deduced and the acceptance angle for the light to pass through the optic fiber cable was studied. Further analysis on the coupling structure and attenuation analysis were performed on the transmission line using test, measurement and simulation tools like OTDR. OTDR is an instrument for fiber optic testing which used to measure, locate, identify and detect optical events at any point of the fiber optic link. The recommendation for this project is to carry out more studies for fiber optical communication for a better understanding of the theory, acquire newer and upgraded version of the fiber optic transmitter/receiver module to improve the results, and simulate the test result with simulation software.
Optical time-domain reflectometer
Fiber-Optic Communication
Cite
Citations (0)
The basic, well-known of the fiber task is to transmit the optical signal along an optical fiber. To achieve this, you should reduce energy losses which result from reflections on the border of core - clad. However, in some cases, the light output can be derived by side surface the fiber. Luminous flux through side surface of optical fiber is realized in many ways. It is possible to change local shape of cylindrical fiber or scattering light on border between core and clad. Side optical fiber with helical spiral core have a different way of side emission. It is the result of controlled scattering inside the optical fiber [1].
Double-clad fiber
Cite
Citations (0)