Magneto‐Optical Switches

Sujatha, K.

doi:10.1002/9781119819264.ch4

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…Forced switching time Figure 6 shows that from the beginning of the decay of high optical power to the end of the stabilization of low optical power, Δt is about 126us, which is much smaller than the inversion time requirement of 1.5ms, and much smaller than the 50ms required by ITU-T. MO-SWITCH needs to change the direction of the magnetic field to control the optical direction during switching, where there is a process of changing the direction of the magnetic field, and this process leads to a downward overshoot in Figure 6, resulting in a waveform that does not simply go from high to low. [11,12] In a normal operating communication system, the switching of the optical path is usually done by automatic switching after a fault is detected, and the automatic switching time is required to be 1.5 ms. Since automatic switching requires the participation of a state machine, this also leads to a corresponding increase in the switching time.…”

Section: δ𝑡 𝑡 𝑡mentioning

confidence: 99%

Design of high-speed optical protection switch mechanism in optical fiber communication system

Ma,

Zhao

2023

5th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2023)

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In recent years, the speed and capacity of fiber optic communication systems have been greatly improved, but in the event of a failure requiring a switching, the 50ms switching time defined by the International Telecommunication Union Telecommunication Standards Branch (ITU-T) can cause a large amount of service data loss compared to low-speed transmission. Therefore, how to minimize the switching time has also become a key issue in protecting the switching. In this paper, we use a magneto-optical switch (MO-Switch) as the core device for protection switching, and design a state machine using FPGA/CPLD to control and design an automatic protection switching (APS) protocol in hardware to realize a 1+1 unidirectional or bidirectional linear protection switching system. The proposed scheme finally achieves a switching time of about 1.5ms, which achieves a performance improvement of more than 95% compared to the standard 50ms and reduces the loss caused by the failure of high-speed fiber optic communication systems.

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Section: δ𝑡 𝑡 𝑡mentioning

confidence: 99%

Design of high-speed optical protection switch mechanism in optical fiber communication system

Ma,

Zhao

2023

5th International Conference on Information Science, Electrical, and Automation Engineering (ISEAE 2023)

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“…It is widely used for fast optical switches, modulators, and optical isolators (OIs) in laser systems. [1][2][3] The latter works as a uni-directional light valve, allowing the propagation of laser beams in only one direction while blocking back-reflections. Thus, it protects laser sources from instabilities, lifetime reduction, or even fatal damage in the case of high-power lasers.…”

Section: Introductionmentioning

confidence: 99%

“…Faraday effect describes the polarization rotation of linearly polarized light when propagating through a media parallel to an applied magnetic field. It is widely used for fast optical switches, modulators, and optical isolators (OIs) in laser systems 1–3 . The latter works as a uni‐directional light valve, allowing the propagation of laser beams in only one direction while blocking back‐reflections.…”

Section: Introductionmentioning

confidence: 99%

CeF₃ single crystals for UV‐VIS‐IR optical isolators

Vı́llora

Yuan

Shimamura

2023

Int J Applied Ceramic Tech

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Optical isolators (OIs) are needed to protect laser sources from back‐reflections. Driven by the fast‐growing market of laser marking and machinery, and the increasing cost of rare‐earth‐based permanent magnets, single‐crystalline Faraday rotators (FRs) with a large Verdet constant V are highly desired to reduce the cost and size of OIs. Furthermore, the need for finer laser procedures (marking, cutting, welding) is shifting the used laser emissions toward shorter wavelengths: into the visible (VIS), where standard Tb3Ga5O12 (TGG) has a poor transmittance, and even into the ultraviolet (UV), where TGG possesses overlapping Tb 4f‐4f absorption bands. In recent years CeF3 has emerged as a new FR with a unique transmittance and an outstanding V in the UV wavelength region, and a superior figure‐of‐merit in the VIS range compared to TGG. Recently, its small thermal lensing and high damage threshold for high‐power have been demonstrated, exhibiting optical isolation > 30 dB under 600 W @ 1070 nm. This review first summarizes the basic properties and crystal growth of CeF3, then focuses on its Faraday magneto‐optical performance. Last but not the least, the typical crystal defects encountered during the development of CeF3 are discussed.

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All-Optical 3-Input XOR Gate Design Using 4:1 Optical Multiplexer with the Proper Application of Nonlinear Kerr Switches

Pandit,

Pahari

2024

Braz J Phys

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Magneto‐Optical Switches

Cited by 3 publications

References 19 publications

Design of high-speed optical protection switch mechanism in optical fiber communication system

Design of high-speed optical protection switch mechanism in optical fiber communication system

CeF₃ single crystals for UV‐VIS‐IR optical isolators

All-Optical 3-Input XOR Gate Design Using 4:1 Optical Multiplexer with the Proper Application of Nonlinear Kerr Switches

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Magneto‐Optical Switches

Cited by 3 publications

References 19 publications

Design of high-speed optical protection switch mechanism in optical fiber communication system

Design of high-speed optical protection switch mechanism in optical fiber communication system

CeF3 single crystals for UV‐VIS‐IR optical isolators

All-Optical 3-Input XOR Gate Design Using 4:1 Optical Multiplexer with the Proper Application of Nonlinear Kerr Switches

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Product

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CeF₃ single crystals for UV‐VIS‐IR optical isolators