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Mode scrambler

About: Mode scrambler is a research topic. Over the lifetime, 896 publications have been published within this topic receiving 13595 citations.


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Patent
22 Sep 2000
TL;DR: In this article, a calibration method based on detecting inter-mode optical transitions (mode hopping) is described, where an optical modulator adds modulation to a beam emitting from the laser to provide the information-carrying laser beam, and a coupler couples the information carrying laser beam into an optical fiber of the optical telecommunications system.
Abstract: An optical fiber transmitter comprises an optically pumped single mode MQW VECSEL for emitting an information-carrying laser beam and has an external cavity length defining a comb of optical modes, each mode corresponding to a channel wavelength of an optical telecommunications system having plural optical channels. A semiconductor structure of the VECSEL has an optical-pump-excited multiple quantum well (MQW) homogeneously broadened gain region active over a band which is less than mode-to-mode spacing, the gain region being tunable to hop from a first mode to an adjacent second mode. A tuning arrangement tunes the VECSEL from mode to mode thereby to select each one of the plural optical channels. An optical modulator adds modulation to a beam emitting from the laser to provide the information-carrying laser beam, and a coupler couples the information-carrying laser beam into an optical fiber of the optical telecommunications system. A calibration method based on detecting inter-mode optical transitions (mode hopping) is described.

27 citations

Patent
14 Sep 1990
TL;DR: In this article, a polarization scrambler comprising a multi-mode fiber spirally or preferably toroidally wrapped about a cylinder or toroid was proposed, which allows a low-cost receiver in a wavelength-division multiplexing communications system.
Abstract: A polarization scrambler comprising a multi-mode fiber spirally or preferably toroidally wrapped about a cylinder or toroid. The multi-mode fiber receives an optical signal from a long single-mode fiber. The optical output of the scrambler has an equal distribution of the two polarization states. Therefore, it can be passed through a polarization-sensitive filter or other optical device. The invention allows a low-cost receiver in a wavelength-division multiplexing communications system.

27 citations

Journal ArticleDOI
TL;DR: Propagation of a higher-order mode in a rectangular-core fiber allows for better thermal management and bend-loss immunity than conventional circular-core fibers, extending the power-handling capabilities of optical fibers.
Abstract: Mode conversion from the fundamental to a higher-order mode in a rectangular-core optical fiber is accomplished by applying pressure with the edge of a flat plate. Modal analysis of the near and far field images of the fiber’s transmitted beam determines the purity of the converted mode. Mode conversion reaching 75% of the targeted higher-order mode is achieved using this technique. Conversion from a higher-order mode back to the fundamental mode is also demonstrated with comparable efficiency. Propagation of a higher-order mode in a rectangular-core fiber allows for better thermal management and bend-loss immunity than conventional circular-core fibers, extending the power-handling capabilities of optical fibers.

27 citations

Journal ArticleDOI
TL;DR: This work analytically derive the coupling matrix of the multimode connector and numerically study the dependence of the matrix coefficients as a function of the butt-joint connection characteristics to assess the impact of the connector on the signal quality investigating different receiver digital signal processing (DSP) schemes.
Abstract: In mode-division multiplexed (MDM) transmission systems, mode coupling is responsible for inter-modal crosstalk. We consider the transmission of modulated signals over a few-mode fiber (FMF) having low mode coupling and large differential mode group delay in the presence of a non-ideal fiber connection responsible for extra mode coupling. In this context, we first analytically derive the coupling matrix of the multimode connector and we numerically study the dependence of the matrix coefficients as a function of the butt-joint connection characteristics. The numerical results are then validated through an experiment with a five-mode setup. Finally, through numerical simulations, we assess the impact of the connector on the signal quality investigating different receiver digital signal processing (DSP) schemes.

27 citations

Patent
12 Jun 1991
TL;DR: In this article, a fiber-optic communication system with a Fabry-Perot laser and a single-mode pigtail is described. And the pigtail can be coupled to a mode scrambler, which divides the laser output power among many modes, so that the fraction of any reflected light that is coupled back into the cavity of the laser can be made small enough to permit sufficient laser coherence for high-data-rate transmission.
Abstract: A fiber-optic communication system (10) employs a Fabry-Perot laser (14) that launches its output onto a single-mode pigtail (16) physically coupled to a mode scrambler (22), which is air coupled to a transmission medium consisting of multi-mode fiber-optic cable. Because the mode scrambler (22) divides the laser output power among many modes, the fraction of any reflected light that is coupled back into the cavity of the laser (14) can be made small enough to permit sufficient laser coherence for high-data-rate-transmission.

27 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20234
202220
20213
20202
20196
20186