![]() An optical isolator is a device that is designed in such a way that it allows the optical signal to travel in the forward direction along with blocking reflections that would travel in the backward direction. In many applications in optical systems, optical isolators are critically important. For example, to external optical feedback, a single-frequency semiconductor laser is very susceptive. To cause a significant increase in laser phase noise, intensity noise, and wavelength instability even a very low level of optical reflection from an external optical circuit, on the order of − 50 dB, is sufficient. Thus, at the output of each laser diode, an optical isolator is needed in applications needing low optical noise and optical frequency that is stable single. In sophisticated lightwave systems, an optical isolator is used where one cannot allow light reflection that might perturb the laser oscillator. However, to maintain system performance one can introduce an optical isolator, but at times cost prevents this. On a Faraday rotator sandwiched between two polarizers, a traditional optical isolator is based. In this particular configuration, the optical signal that comes from the left side then passes through the first polarizer whose optical switch is in the vertical direction, which matches the polarization orientation of the input optical signal. Then, in a clockwise direction, the polarization of the optical signal is rotated by a Faraday rotator by 45 degrees. Concerning the first polarizer, the optical axis of the second polarizer is oriented 45 degrees, which then allows the optical signal to pass through with little attenuation. The reflected optical signal has to pass through the Faraday rotator from right to left only when there is a reflection from the optical circuit at the right side. As the Faraday rotator is a nonreciprocal device so in the same direction as the input signal, the polarization state of the reflected optical signal will rotate for an additional 45 degrees, thus becoming horizontal, which is perpendicular to the optical amplifier of the first polarizer. In this way, the first polarizer effectively blocks the reflected optical signal and the unidirectional transmission of the optical isolator is assured.
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![]() Conventional dual-fiber patch cables like LC cable can no longer meet the demands with the development of ever-greater bandwidths and network connections to deal with in data centers. MTP/MPO cables, to solve this particular problem, arrived in the market. In one multi-fiber MTP/MPO connector, it accommodates more fibers, which is a practical solution for high-density cabling in data centers. Overview of MTP/MPO Cable Of clip clamping multi-core optical fiber connectors, MPO (Multi-Fiber Push-on) is the first generation. In the US, MTP is a registered trademark that is an advanced version of MPO, with good mechanical and optical performance. They are completely compatible and look very the same. MTP/MPO connectors and optical fibers when combined results in MTP/MPO cables. MTP/MPO connectors usually have a female type (without pins) or a male one (with pins). What results in Key Up and Key down MTP/MPO connectors are the positions of guide and grooves? In connectors for identifying fiber position, a white dot is required. By MTP/MPO connectors, the MPO/MTP trunk cable density is largely increased and circuit card, as well as rack space, is saved, which for current 40G/100G cabling and upgrades of future network speed are well suited. MTP/MPO Cable Solutions For different application environments and requirements based on fiber count, functions, polarity, fiber mode, and jacket rating a variety of MPO/MTP breakout cables are available. MTP/MPO Trunk Cables On both ends, MTP/MPO trunk cable is terminated with an MTP/MPO connector (female/male), which for users’ choices is available in 8-144 fiber counts. Typically, for creating a structured cabling system, including backbone and horizontal interconnections such as 40G-40G and 100G-100G direct connections these multi-fiber MTP/MPO trunk cables are quite ideal; hence they achieve a simple and efficient high-performance networking. By Function For high-density cabling network MTP/MPO trunk cables, MTP/MPO cables, and MTP/MPO conversion cables are ideal and they offer better network capacity and flexibility. Conclusion In terms of fiber mode, cable function, polarity, fiber count, and jacket rating, and with a variety of MTP or MTP breakout cables available, it would be better that we consider specific needs when selecting suitable MTP/MPO cable solutions. |
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