Showing 1-25 of 9,415 resultsfor "Index Terms":Input Polarization
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Channel Capacity Measurement of 8\,\times\, 2 MIMO Transmission by Antenna Configurations in an Actual Cellular Environment
Experimental results are presented for an 8times2 multiple-input multiple-output (MIMO) channel in an actual cellular environment. This paper focuses in particular on the characteristics of the channel capacity based on the number of antennas and the difference in antenna polarizations, i.e., vertical, vertical and horizontal, and slanted plusmn45deg, at both the base and the terminal stations. Th...Show More
Analysis of Degree of Polarization as a Control Signal in PMD Compensation Systems Aided by Polarization Scrambling
Journal of Lightwave Technology
Cited by: Papers (6)
The performance of degree of polarization (DOP) is investigated as a control signal in polarization-mode dispersion (PMD) compensation systems aided by polarization scrambling. The relation between the input and output polarization states of a signal propagating through a polarization scrambler and a PMD-induced optical fiber is described by a 3 times 3 Stokes transfer matrix. The average DOP of t...Show More
MIMO Channel Capacity with Polarization Diversity and Power Allocation Technique
2007 IEEE International Conference on Signal Processing and Communications
Year: 2007 | Conference Paper |
Cited by: Papers (3)
This paper considers the use of 4 × 4 multiple-input multiple-output (MIMO) antenna arrays for improving the mutual information with and without polarization diversity. The authors focus on the benefits offered by a combination of spatial and polarization diversity techniques. In this paper, are taken in consideration the cases where the channel state information (CSI) is known or unknown to trans...Show More
A Polarization Reconfigurable Cockroach Shaped Microstrip Patch Antenna for WLAN Applications
Debprosad Das;Farhin Sultana;Md. Farhad Hossain;Md. Azad Hossain
2023 IEEE 9th International Women in Engineering (WIE) Conference on Electrical and Computer Engineering (WIECON-ECE)
Year: 2023 | Conference Paper |
This work designs and analyzes a cockroach-shaped microstrip patch antenna on a Teflon Glass Fiber substrate for polarization reconfigurability. Hind leg of the cockroach is considered for microstrip feed line and antenna of the cockroach body is used as stub. Two diodes are inserted between cockroach head and stub. Depending on the diode and input port variations, the antenna can switch between f...Show More
Low-Polarization-Dependent $1\times 2$ Carrier-Injection-Type Silicon Photonics Switch
2023 International Conference on Photonics in Switching and Computing (PSC)
Year: 2023 | Conference Paper |
We propose a low-polarization-dependent $1\times 2$ carrier-injection-type silicon photonics switch consisting of polarization splitters, rotators, bidirectional light injection, and an optical circulator. A Polarization-dependent loss (PDL) of 3.5dB is achieved, and reduced polarization dependence was confirmed through BER measurements.Show More
MIMO Channel Capacity With Polarization Diversity in Arched Tunnels
Jose-Maria Molina-Garcia-Pardo;Martine Lienard;Pierre Degauque;Concepcin Garcia-Pardo;Leandro Juan-Llacer
This letter studies the possible application of MIMO polarization diversity in road/railway tunnels. By means of an extensive measurement campaign extending from 2.8 to 5 GHz, different linear array architectures were studied, considering different polarizations within each array. Channel capacity was calculated assuming either a constant signal-to-noise ratio (SNR), whatever the array architectur...Show More
Real-Time Multi-Gigabit Receiver for Coherent Optical MIMO-OFDM Signals
In this paper we implement a first multi-gigabit real-time dual-polarization CO-OFDM receiver in a 2 times 2 multiple-input multiple-output (MIMO) configuration. The experimental setup consists of four 1.5 Giga samples per second (GS/s) high-speed analog-to-digital converters (ADC) and one Stratix III field-programmable gate array (FPGA). The signal streams are processed in real-time mode, and the...Show More
Simulation of MIMO channel capacity with antenna polarization diversity
A simulation study of the channel capacity of a multiple-input multiple-output (MIMO) antenna system exploiting multiple polarizations is carried out. We focus on a simple yet realistic trimonopole antenna structure, taking into account all the mutual coupling and casing effects using the computational electromagnetics solver-numerical electromagnetics code. Simulation results show that, with a sp...Show More
SOA-Assisted Data-Polarization-Insensitive Wavelength Conversion in a PPLN Waveguide
Irfan Fazal;Saurabh Kumar;Yunchu Li;Lou Christen;Poorya Saghari;Carsten Langrock;M. M. Fejer;Alan E. Willner
Journal of Lightwave Technology
Cited by: Papers (5)
We demonstrate a novel method of wavelength conversion in a periodically poled lithium niobate (PPLN) waveguide using polarization modulation and amplitude modulation of its pump. Polarization-insensitive, all-optical, intensity-to-polarization conversion in a semiconductor optical amplifier (SOA) is used to reduce the waveguide's polarization sensitivity from >30 dB to <1 dB. We demonstrate BER m...Show More
Coherent Model for Cross-Polarization Coupling From a Single Point-Like Perturbation in Optical Fibers
The transfer matrix is proposed to describe the coherent cross-polarization coupling (CPC) induced by a single point-like perturbation (PLP) in optical fibers. This matrix remains independent of the fiber length, making it suitable for characterizing the PLP that have a zero-dimensional impact on fiber length. Consequently, the fiber can be fully characterized by a matrix combining the transfer ma...Show More
Polar decomposition of the transmission matrix allows lumped polarization-dependent loss (PDL) followed by lumped polarization mode dispersion (PMD) compensation at the receiver's end. Thus, we propose in this paper, the architecture of a broad-band PDL compensator in a feed-forward compensation scheme. This module consists of three stages. Stage 1 and 2 are the frequency-dependent polarization ro...Show More
60-GHz Polarization-Adjustable Antenna Arrays
This paper proposes 2 × 2 and 4 × 4 polarization-adjustable millimeter-wave antenna arrays. The antennas were designed to function at 60 GHz and are planar and vialess. The proposed antenna designs contain two input ports; if the input phases and magnitudes of the two input ports can be controlled, enabling the proposed antenna to generate six types of polarization: right-handed circular polarizat...Show More
Degree-of-polarization and eye-closure penalty associated with optical signals with orthogonal polarizations
We perform a systematic measurement of the degree-of-polarization (DOP) and eye-closure penalty for optical signals with orthogonal polarizations. We find that the symmetry of DOP is maintained for the orthogonal polarizations under both first and higher order polarization-mode dispersion (PMD), whereas the symmetry of eye-closure penalty is broken under second-order PMD. An orthogonal polarizatio...Show More
Joint Polarization Tracking and Equalization in Real-Time Coherent Optical Receiver
Xu Zhang;Tao Zeng;Xiang Li;Jie Li;Lingheng Meng;Feng Jiang;Ziqing Liu;Shaohua Yu
We experimentally demonstrate a real-time polarization tracking and equalization method based on the state of polarization detection from the adaptive finite impulse response (FIR) filter coefficients in a polarization division multiplexed (PDM) coherent optical communication system. By calculating the variation of the polarization within a time interval, the polarization rotation speed can be eva...Show More
High-speed and highly repeatable polarization-state analyzer for 40-gb/s system performance monitoring
L.-S. Yan;X.S. Yao;C. Yu;Y. Wang;L. Lin;Z. Chen;A.E. Willner
We demonstrate a fast (<1 ms), all solid-state, highly repeatable, and accurate polarization-state analyzer based on magnetooptic polarization switches. The module is further used for optical signal-to-noise-ratio performance monitoring in a 14/spl times/40-Gb/s wavelength-division-multiplexing system.Show More
Planar four-port quadri-polarization slot antenna for millimeter wave application
2014 International Workshop on Antenna Technology: Small Antennas, Novel EM Structures and Materials, and Applications (iWAT)
Year: 2014 | Conference Paper |
Cited by: Papers (3)
This paper presents a planar, vialess printed slot dipole antenna with polarization switchable characteristic. The proposed design comprises four input ports, and each input ports corresponds to different polarizations such as horizontal polarization, vertical polarization, right-handed circular polarization, and left-handed circular polarization. Because lumped diodes are not available in millime...Show More
The Role of Polarization Diversity for MIMO Systems Under Rayleigh-Fading Environments
J. F. Valenzuela-valdes;M. A. Garcia-fernandez;A. M. Martinez-gonzalez;D. Sanchez-Hernandez
Polarization diversity techniques have not received as much attention as others due to the significant difference in mean signal level between copolarized and cross-polarized branches when one polarization is transmitted. However, multiple-input-multiple-output (MIMO) systems where the multipath fading is only partially correlated could use polarization diversity to provide a high diversity gain. ...Show More
A fiber depolarizer using polarization beam splitter loop structure for narrow linewidth light source
IEEE Photonics Technology Letters
Cited by: Papers (19)
A new fiber depolarizer employing a polarization beam splitter loop structure is proposed and demonstrated. The depolarizer is devised for broad-band operation and the depolarization of narrow linewidth light source without any help of polarization controllers or Faraday rotator mirrors. A polarizing method is developed that shows good performance without polarization control unit. Therefore, the ...Show More
Effects of Polarization Modulation Induced by Electro-Optic Modulators in Fiber-Based Setups
Frédéric Du-Burck;Karim Manamanni;Tatiana Steshchenko;Amine Chaouche Ramdane;Vincent Roncin
IEEE Photonics Technology Letters
Cited by: Papers (1)
Using the Jones formalism, it is shown that electro-optic modulators used for phase modulation generate a modulation of the output polarization induced by the difference of phase modulation depth along the crystallographic axes of the modulator. We study two consequences of this polarization modulation in the fiber setups, limiting the performance of high sensitivity measurement devices. The first...Show More
WDM Performance and PMD Tolerance of a Coherent 40-Gbit/s Dual-Polarization QPSK Transceiver
Charles Laperle;Bernard Villeneuve;Zhuhong Zhang;Doug McGhan;Han Sun;Maurice O'Sullivan
We report the measured wavelength-division-multiplexing (WDM) performance and polarization-mode dispersion (PMD) tolerance of a coherent 40-Gbit/s dual-polarization quadrature phase shift keying (DP-QPSK) transceiver at 50-GHz minimum channel spacing in a 40-channel 40-span test bed comprised of 3200 km of uncompensated G.652 fiber. We also evaluate the impact of polarization-dependent loss (PDL) ...Show More
The impact of polarization-mode dispersion (PMD) on four-wave mixing crosstalk in wavelength-division-multiplexed (WDM) fiber systems is quantified on a commercial system. It is found that even a small amount of PMD reduces the benefit of using polarization-multiplexed channels for suppression of crosstalk. As a rule of thumb, it is suggested that polarization-multiplexed schemes are of significan...Show More
Polarization measurements and modeling in indoor NLOS environments
Francois Quitin;Claude Oestges;Francois Horlin;Philippe De Doncker
Cross-polarized antenna systems are an attractive way to reduce equipment size while maintaining low interantenna correlation. In this paper, the polarization behaviour of indoor channels is investigated. A measurement campaign has been conducted at 3.6 GHz for a dual-polarized transmitter and a tri-polarized receiver in a non-Line-of-Sight (NLOS) scenario. The spatial and delay characteristics ar...Show More
Pulsewidth compression in optical components with polarization mode dispersion using polarization controls
Journal of Lightwave Technology
Cited by: Papers (9)
An algorithm capable of finding the input and output states of polarization for pulsewidth narrowing at the output of an optical fiber with polarization mode dispersion (PMD) is analytically presented and numerically solved. It has been demonstrated theoretically and experimentally that the output pulses can he narrower than the input pulses when PMD is compensated by controlling both the input po...Show More
Small-signal analysis of amplitude-, phase-, and polarization-to-intensity conversion in general optical linear systems with application to PMD compensation
Journal of Lightwave Technology
Cited by: Papers (4)
A general small-signal model for amplitude-, phase-, and polarization-to-intensity conversion in optical systems affected by chromatic dispersion, polarization-mode dispersion (PMD), and polarization-dependent loss (PDL) is presented, which extends a previous scalar model by Wang and Petermann . The model leads to simple intensity filters, which can be expressed as a linear combination of the comp...Show More
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