Topic
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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TL;DR: In this paper, the authors present a theoretical study on the mode coupling between core modes and cladding modes of the tilted long period fiber grating (TLPFG) in dual-mode fiber.
10 citations
Patent•
09 Nov 1971
TL;DR: In this paper, a wide band multi-mode feed device, capable of propagating a TE10 and a hybrid shaping mode, is provided, which is most useful for high efficiency monopulse antenna systems and especially for systems where accurate gathering and analysis of tracking data is a prime requisite.
Abstract: A wide band multi-mode feed device, capable of propagating a TE10 and a hybrid shaping mode is provided. A narrow ridge hybrid mode generator, disposed between a mode cavity and a mode phasor, controls a sum pattern E-plane shaping mode. The narrow ridge provides only a negligible coupling to the TE20 mode since the narrow ridges are placed only in the null regions of the TE20 mode. The mode cavity and an inverse mode launcher control unwanted cross polarization resulting from the TE11 and TM11 modes. This device is most useful for high efficiency monopulse antenna systems and especially for systems where the accurate gathering and analysis of tracking data is a prime requisite.
10 citations
TL;DR: In this article, a combinatorial approach to build polarization scrambler in a many-segment polarization-mode dispersion (PMD) emulator is presented. But the approach is limited to a few phase plates.
Abstract: In this letter, we present a combinatorial approach to build polarization scramblers in a many-segment polarization-mode dispersion (PMD) emulator. This approach significantly reduces the required number of phase plates and their corresponding controls. It exploits the fact that rotation matrices are noncommutative which gives many different ways of building polarization scramblers out of just a few phase plates. Although these polarization scramblers are correlated, we show, numerically and experimentally, that there is sufficient polarization scrambling between segments to achieve the important key properties of a PMD emulator.
10 citations
TL;DR: A holey cladding dielectric waveguide with square cross section is designed, simulated, fabricated and characterized and good agreement between the measured mode distribution and the calculated mode distribution is demonstrated.
Abstract: A holey cladding dielectric waveguide with square cross section is designed, simulated, fabricated and characterized. The TOPAS waveguide is designed to be single mode across the broad frequency range of 180 GHz to 360 GHz as shown by finite-difference time domain simulation and to robustly support simultaneous TE and TM mode propagation. The square fiber geometry is realized by pulling through a heat distribution made square by appropriate furnace design. The transmitted mode profile is imaged using a vector network analyzer with a pinhole at the receiver module. Good agreement between the measured mode distribution and the calculated mode distribution is demonstrated.
10 citations
TL;DR: In this article, the potentialities of independent tailoring the index and gain profiles in fiber laser aiming to achieve a strong modal discrimination are theoretically examined, and it is demonstrated by numerical simulations existence of fiber amplifier constructions which have the flattened fundamental mode profile in the gain region.
Abstract: Potentialities of independent tailoring the index and gain profiles in fiber laser aiming to achieve a strong modal discrimination are theoretically examined. It is demonstrated by numerical simulations existence of fiber amplifier constructions which have the flattened fundamental mode profile in the gain region. It is shown that the fundamental mode retain the largest modal gain in comparison with modal gains of higher-order-modes for any depletion of the gain by the fundamental mode. The particular design is presented with the flattened fundamental mode area 6360 μm squared.
10 citations