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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19 Oct 2015
TL;DR: In this article, an optical device includes an optical bench and two flip-chip-bonded optical chips, where the first optical chip is flipped-chip bonded based on the determined location of the output optical mode.
Abstract: An optical device includes an optical bench and two flip-chip bonded optical chips. The optical bench includes a large area slab waveguide structure which has an input facet facing the first optical chip, an output facet facing the second optical chip, and one or more curved facet which reflects the slab mode light such that the input optical mode coupled through the input facet diverges in the slab waveguide plane as it propagates, reflects at the one or more curved facets, and focuses to an output optical mode at the output facet with mode size larger than the input optical mode in the in-plane direction. During fabrication, after the first optical chip is flip-chip bonded, the location of the focused output optical mode on the output facet is determined, and then the second optical chip is flip-chip bonded based on the determined location of the output optical mode.
2 citations
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2 citations
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28 Jan 2009TL;DR: In this paper, an acousto-optic mode converter (AOMC) is used to convert an optical signal of a specific optical frequency corresponding to a frequency of an electric signal.
Abstract: Provided are an acousto-optic filter and an optical code division multiple access (CDMA) system using the acousto-optic filter. The acousto-optic filer includes: an acousto-optic mode converter (AOMC) converting an optical signal of a specific optical frequency corresponding to a frequency of an electric signal of an optical signal of a first mode having a predetermined optical frequency band; and a mode stripper (MS) stripping an optical signal of the optical signal of the first mode that has been converted to a second mode.
2 citations
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01 Sep 1996
TL;DR: In this paper, the center mode of a 3∼4-mode oscillating laser tube was used as a single-mode He-Ne laser to obtain the highest intensity, single-neighboring laser.
Abstract: Highest intensity, single mode He-Ne laser can be obtained by combination of 3-modes operation of a 3∼4 modes oscillating laser tube and a polarizer for selection of a single mode. In this experiment, as a 3∼4 modes oscillating laser tube, a tube whose cavity length is 35cm and output intensity is 5mW was employed. By selectively using the center mode of 3-modes oscillation as a single mode, highest intensity, single mode He-Ne laser has been realized. For a particular mode stabilization, the polarization stabilization method whose control signal is intensity is usually used. However, mode stabilization at the gain curve center is difficult in this method. Moreover, detection of the intensity is uncertain due to temperature drifts in the detector sensitivity and amplifiers, and contamination in the cavity mirror and detector surface, resulting in decreasing the frequency stability. In this experiment, intermode beat frequency change by Frequency Pulling which is strongly related to the mode position was utilized for the stabilization. The difference frequency of two intermode beats generated by the center mode and two other modes which oscillate at each side of the center mode is used as a control signal. It is convenient for the stabilization that the position of this frequency variation corresponding to the most intense center mode oscillation is at middle of its slope. Because the control signal based upon the frequency can be processed digitally, this stabilization method is free from uncertainties which is inevitable in the polarization stabilization method.
2 citations
01 Jan 2015
TL;DR: In this paper, a theoretical model to analyze the mode coupling induced by heat, when the fiber amplifier works at high power configuration, is proposed, mainly taking into consideration the mode field change due to the thermally induced refractive index change and the coupling between modes.
Abstract: In this paper,a theoretical model to analyze the mode coupling induced by heat,when the fiber amplifier works at high power configuration,is proposed.The model mainly takes into consideration the mode field change due to the thermally induced refractive index change and the coupling between modes.A method to predict the largest average output power of fiber is also proposed according to the mode coupling theory.The largest average output power of a large pitch fiber with a core diameter of 190 μm and an available pulse energy of 100 mJ is predicted to be 540 W,which is the highest in large mode field fibers.
2 citations