In-band optical signal-to-noise ratio monitoring for suppression of effects of both polarization mode dispersion and the polarization extinction ratio of a polarization beam splitter based on enhanced tracking of the principal states of polarization

2013 ◽  
Vol 62 (6) ◽  
pp. 897-901
Author(s):  
Ki Ho Han
Keyword(s):  
Beam Splitter ◽  
Signal To Noise Ratio ◽  
Extinction Ratio ◽  
Polarization Mode Dispersion ◽  
Optical Signal ◽  
Polarization Beam Splitter ◽  
Polarization Mode ◽  
Signal To Noise ◽  
Mode Dispersion ◽  
Polarization Extinction Ratio

scholarly journals Compact Photonic Crystal Polarization Beam Splitter Based on the Self-Collimation Effect

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 198
Author(s):  
Geyu Tang ◽  
Huamao Huang ◽  
Yuqi Liu ◽  
Hong Wang
Keyword(s):  
Optical Communications ◽  
Beam Splitter ◽  
Extinction Ratio ◽  
Polarized Light ◽  
The Self ◽  
Polarization Beam Splitter ◽  
Optical Interconnection ◽  
Beam Splitting ◽  
Beam Splitters ◽  
Polarization Extinction Ratio

We propose a new compact polarization beam splitter based on the self-collimation effect of two-dimensional photonic crystals and photonic bandgap characteristics. The device is composed of a rectangular air holes-based polarization beam splitting structure and circular air holes-based self-collimating structure. By inserting the polarization beam splitting structure into the self-collimating structure, the TE and TM polarized lights are orthogonally separated at their junction. When the number of rows in the hypotenuse of the inserted rectangular holes is 5, the transmittance of TE polarized light at 1550 nm is 95.4% and the corresponding polarization extinction ratio is 23 dB; on the other hand, the transmittance of TM polarized light is 88.5% and the corresponding polarization extinction ratio is 37 dB. For TE and TM polarized lights covering a 100 nm bandwidth, the TE and TM polarization extinction ratios are higher than 18 dB and 30 dB, respectively. Compared with the previous polarization beam splitters, our structure is simple, the size is small, and the extinction ratio is high, which meets the needs of modern optical communications, optical interconnection, and optical integrated systems.

scholarly journals The influence of gamma radiation on polarization mode dispersion of fibers applied in communications

2012 ◽  
Vol 27 (2) ◽  
pp. 171-177 ◽  
Author(s):  
Rade Sekulic ◽  
Nikola Slavkovic ◽  
Milesa Sreckovic ◽  
Milojko Kovacevic ◽  
Miljan Stamenovic
Keyword(s):  
Optical Fiber ◽  
Gamma Radiation ◽  
Fiber Optics ◽  
Light Propagation ◽  
Signal Transmission ◽  
Polarization Mode Dispersion ◽  
Optical Signal ◽  
Polarization Mode ◽  
Mode Dispersion ◽  
Fiber Technology

The fiber optics technology is constantly being developed, and is becoming an essential component of contemporary communications, medicine and industry. Fibers, their connections and system components play a major role in optical signal transmission, telecommunications, power transmission, and sensing processes using fiber technology. The two main light propagation characteristics of an optical fiber are attenuation and dispersion. The possibility of controling these parameters is of utmost importance for obtaining the requested transmission quality. This paper reports on an investigation to determine the influence of gamma radiation of 60Co on the variation of optical fiber propagation parameters, such as polarization mode dispersion. In addition, it also considers chosen topics in the field of fiber optics technology.

Interferometric optical signal-to-noise ratio measurements of telecom signals with degraded extinction ratio

2008 ◽  
Vol 33 (18) ◽  
pp. 2065 ◽  
Author(s):  
J. M. Oh ◽  
M. Brodsky ◽  
L. E. Nelson ◽  
G. Cadena ◽  
M. D. Feuer
Keyword(s):  
Signal To Noise Ratio ◽  
Extinction Ratio ◽  
Optical Signal ◽  
Signal To Noise ◽  
Noise Ratio

scholarly journals POLARIZATION MODE DISPERSION COMPENSATOR BASED ON ANISOTROPIC OPTICAL FIBER

2020 ◽  
Vol 1 (1) ◽  
pp. 12-18
Author(s):  
O.M Staschuk ◽  
◽  
D.M Stepanov ◽  
D.H. Bahachuk
Keyword(s):  
Optical Fiber ◽  
Polarization Mode Dispersion ◽  
Optical Signal ◽  
Chemical Compositions ◽  
Polarization Mode ◽  
Double Refraction ◽  
Dispersion Compensator ◽  
Mode Dispersion ◽  
Wide Range ◽  
Polarization Mode Dispersion Compensator

Abstract. In this paper, a new method of polarization mode dispersion (PMD), which can significantly limit the speed and range of transmission of fiber optic transmission systems (FOTS), compensation was developed and analyzed. In contrast to the existing types of PMD compensators, in which the optical fiber is subjected to mechanical stresses to create a photoelastic anisotropy, in this work the use of alternative method of creating photoelasticity in optical fiber (OF) by creating a helical ordered rotation of the glass microstructure (ORMG) is proposed. The helical orientation of the microstructure of the OF glass is achieved by acting on the fiber in the process of manufacture (drawing), when it is in a hot state, electromagnetic field, the power lines of which are directed in a circle. I am not sure what this sentence is trying to say. The result is an asymmetry of the dielectric constant of the fiber glass material and therefore the anisotropy of the optical properties. When the optical signal propagates in such OF, there is a double refraction, which is the cause of artificial PMD in the compensator fiber. Compensation is achieved by performing the equality of the modulus and the sign-opposite between the linear path PMD and the PMD of the anisotropic OF with the ORMG. The expression of the calculation of the PMD of the compensator, which depends on the rotation step of the microstructure of the glass, the chemical composition of the OF, the length of the line, the width of the radiation spectrum and the wavelength of the optical signal, and the optical characteristics of the OF, is analyzed, as well as the spectral dependence of polarization mode dispersion for different chemical compositions of the OF. The expression of determining the length of the OF with the ORMG is presented to compensate for the set value of the PMD in the line. The results of the studies made it possible to determine the lengths of the segments of OF with ORMG, which will provide partial or complete compensation of PMD over a wide range of wavelengths and create passive compensators for dispersion.

scholarly journals An ultra-flat, low-noise and linearly polarized fiber supercontinuum source covering 670 nm-1390 nm

2021 ◽  
Author(s):  
Etienne Genier
Keyword(s):  
Signal To Noise Ratio ◽  
Extinction Ratio ◽  
Low Noise ◽  
Signal To Noise ◽  
Crystal Fiber ◽  
Linearly Polarized ◽  
Potential Applications ◽  
Imaging And Spectroscopy ◽  
Polarization Extinction Ratio ◽  
Good Agreement

We report an octave-spanning coherent supercontinuum (SC) fiber laser with excellentnoise and polarization properties. This was achieved by pumping a highly birefringent all-normaldispersion (ANDi) photonic crystal fiber with a compact high-power ytterbium femtosecond laserat 1049 nm. This system generates an ultra-flat SC spectrum from 670 nm to 1390 nm with apower spectral density higher than 0.4 mW/nm and a polarization extinction ratio of 17 dB acrossthe entire bandwidth. An average pulse-to-pulse relative intensity noise (RIN) down to 0.54%from 700 nm to 1100 nm has been measured and found to be in good agreement with numericalsimulations. This highly-stable broadband source could find strong potential applications inbiomedical imaging and spectroscopy where improved signal to noise ratio is essential.

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