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, a fundamental/first-order mode converter based on multimode interference coupler on InP substrate was designed, and detailed optimization of the device parameters were investigated using 3D beam propagation method.
Abstract: The design, fabrication and characterization of a fundamental/first-order mode converter based on multimode interference coupler on InP substrate were reported. Detailed optimization of the device parameters were investigated using 3D beam propagation method. In the experiments, the fabricated mode converter realized mode conversion from the fundamental mode to the first-order mode in the wavelength range of 1530–1565 nm with excess loss less than 3 dB. Moreover, LP01 and LP11 fiber modes were successfully excited from a few-mode fiber by using the device. This InP-based mode converter can be a possible candidate for integrated transceivers for future mode-division multiplexing system.
9 citations
Patent•
25 Oct 2002
TL;DR: A twisted nematic bistable liquid crystal (2) switching between two stable states in a high voltage mode is used in an AMLCD low voltage drive as mentioned in this paper, enabling the display to be used also in a fast video mode.
Abstract: A twisted nematic bistable liquid crystal (2) switching between two stable states in a high voltage mode is used in an AMLCD low voltage drive. The picture electrodes (14) and the counter electrode (15) are part of an active matrix, enabling the display to be used also in a fast video mode. Thus, a bistable liquid crystal display device is provided which has two drive modes, a low frequency mode, (first drive mode, also called “bistable mode”, “passive mode” or “high voltage mode”) for applications requiring slower switching times and lower power consumption and a high frequency mode (second drive mode, also called “active mode, “active matrix drive mode” or “fast video mode”) for grey scale images and video applications.
9 citations
TL;DR: In this article, the external mode coupling in optical microresonators with a loss-dependent coupling coefficient is studied, and the authors show that the localized cavity loss can suppress the original whispering gallery modes and generate high-Q coupled modes, which illustrate a possible way to dynamically control the optical modes inside the micro-resonator.
Abstract: We study the external mode coupling in optical microresonators with a loss-dependent coupling coefficient. In the case of dielectric optical microresonators with localized absorption or radiation loss, the mode coupling between whispering gallery modes (WGMs) can result in a destructive interference of the mode fields in the lossy area and consequently reduce the mode loss. Once the reduction overcomes the introduced loss, the actual mode loss is reduced by increasing the loss factor. An anomalous relation between the actual mode loss and the introduced loss factor is then found, while the mode frequencies show parallel, crossing, or anticrossing behavior under different coupling conditions; such phenomena can be well explained by the analysis based on the coupling theory. The results show that the localized cavity loss can suppress the original WGMs and generate high-Q coupled modes, which illustrate a possible way to dynamically control the optical modes inside the microresonator.
9 citations
TL;DR: In this paper, an experimental investigation about the reliability of an attractive method recently proposed for modal power distribution measurements in multimode fibres is performed, and the method is shown to work also in some common cases when the hypotheses of validity are not rigorously fulfilled.
Abstract: An experimental investigation about the reliability of an attractive method recently proposed for modal power distribution measurements in multimode fibres is performed. The method is shown to work also in some common cases when the hypotheses of validity are not rigorously fulfilled. Finally, an illustrative application to the testing of mode scramblers is presented.
9 citations
Patent•
06 Jul 2001
TL;DR: In this article, a pumped-fibre laser with a spatial mode converting device receiving the beam is described, which is referred to as a multimodal laser, where the doped fiber has a core with diameter greater than 30 micrometers.
Abstract: The invention concerns a pumped fibre laser comprising essentially a doped fibre (1), Said laser is mainly characterised in that the doped fibre is multimode (1) and it also comprises a spatial mode converting device (3) receiving the beam. Said multimode fibre has a core with diameter greater than 30 micrometers, even greater than 50 micrometers.
9 citations