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Optical polarization

About: Optical polarization is a research topic. Over the lifetime, 13992 publications have been published within this topic receiving 244284 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors performed a comprehensive investigation of techniques to implement on-off keying (OOK), bi-phase modulation (BPM), pulse-amplitude modulation (PAM), pulse shape modulation (PSM), and PPM based on a phase modulator and an asymmetric Mach-Zehnder interferometer.
Abstract: The distribution of ultra-wideband (UWB) signals over optical fiber, or UWB over fiber (UWBoF), is proposed to extend the area of coverage and to offer the availability of undisrupted service across different networks. Various techniques have been reported recently for optical UWB pulse generation, but the study on the implementation of different modulation schemes based on these UWB pulses has just started. In addition, the influence of fiber dispersion on the power spectral density (PSD) of an UWB signal, and the bit-error-rate performance of an UWBoF system with different modulation schemes have not been systematically investigated. In this paper, we perform a comprehensive investigation of techniques to implement on-off keying (OOK), bi-phase modulation (BPM), pulse-amplitude modulation (PAM), pulse shape modulation (PSM), and pulse-position modulation (PPM) based on a phase modulator and an asymmetric Mach-Zehnder interferometer (AMZI). The AMZI is electrically reconfigurable by employing a polarization modulator (PolM). UWB signals with OOK, BPM, PAM, PSM, and PPM are realized by adjusting the polarization controllers in the AMZI and the amplitude of the electrical drive signal to the PolM. The UWB signals with OOK, BPM, PAM, and PSM are transmitted over a wired (single-mode fiber) and wireless link. Error-free operation is obtained for all the modulation schemes. The power penalties of transmission are less than 1.8 dB. The fiber dispersion on the PSD of the UWB signals is also theoretically studied and experimentally evaluated. An excellent agreement between the theoretical and the experimental results is achieved. The system is potentially integratable, which may provide a simple and cost-effective solution for UWBoF applications.

126 citations

Journal ArticleDOI
TL;DR: In this article, a general study of transverse energy flows (TEF) as physically meaningful and informative characteristics of paraxial light beams' spatial structure is presented, where the total TEF can be decomposed into the spin and orbital contributions giving rise to the spin angular momentums, correspondingly.

126 citations

Journal ArticleDOI
TL;DR: In this article, the authors describe measurements of pulses consisting of only eight optical periods, which were produced by compression with a short optical fiber and a grating pair, by autocorrelation using noncollinear second harmonic generation in a thin crystal of potassium dihydrogen phosphate.
Abstract: We describe measurements of pulses consisting of only eight optical periods. The pulses were produced by compression with a short optical fiber and a grating pair. Measurement was by autocorrelation using noncollinear second harmonic generation in a thin crystal of potassium dihydrogen phosphate.

125 citations

Journal ArticleDOI
TL;DR: In this article, a rotor is built that changes the direction of rotation by changing its position relative to the focus, which is based on the very high numerical aperture of the focused light in the tweezers.
Abstract: Micrometer size rotors are produced by light induced polymerization of light curing resin. The propeller shaped rotors trapped in laser tweezers are rotated by the trapping light. A rotor is built that changes the direction of rotation by changing its position relative to the focus. The design is based on the very high numerical aperture of the focused light in the tweezers: the light has a large average component of momentum pointing perpendicular to the optical axis, in the opposite direction before and behind the focus. This perpendicular component drives the rotation and the direction changes when the rotor is moving around the focus.

125 citations

Journal ArticleDOI
TL;DR: In this paper, a TE/TM polarization mode converter was constructed by inserting a polyimide half waveplate into a groove formed in a silica-based single mode waveguide.
Abstract: A TE/TM polarization mode converter, with an excess loss of 0.26 dB, is constructed by inserting a polyimide half waveplate into a groove formed in a silica-based single mode waveguide. The polarization dependence of an arrayed-waveguide grating multiplexer is completely eliminated with this mode converter. >

125 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20221
2021404
2020359
2019318
2018470
2017504