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Archived — Passive Components


What Are APC (Angled Physical Contact) Fiber Connectors?

:: What Are APC Connectors? APC Connector is a type of fiber connector that minimizes backreflection due to a 5° to 15° angle-polish applied to end faces. Like illustrated in the following picture. Because of the angle, the reflected light does not stay in the fiber core but instead leaks out into the cladding. Angle-polished connectors should only be mated to other angle-polished connectors. Mating to a non-angle polished connector causes very high insertion loss. Generally angle-polished connectors have higher insertion loss than good quality straight physical contact ones. “Ultra” quality connectors may achieve comparable back reflection to an angled

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What are Fiber Optic Attenuators?

  Fiber optic attenuators are used in applications where the optical signal is too strong and needs to be reduced. For example, in a multi-wavelength fiber optic system, you need to equalize the optical channel strength so that all the channels have similar power levels. This means to reduce stronger channels’ powers to match lower power channels.  Another example is when the received optical power is so strong that it saturates the receiver, you need an attenuator to reduce the power so the receiver can detect the signal correctly. This picture shows an example of a fixed optical attenuator. The

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How to Use 3M 6851-E Duplex Polishing Machine with Universal Dual Holder

>> Introduction The Duplex Polishing Machine 6851-E is intended for use to polish two LAN connectors at a time, and virtually eliminates the need to exchange the holder if switching from one connector type to another. For use with 3M Hot Melt ST, SC or FC Physical Contact (PC) connectors.   >> 1. General The 3M duplex polishing machine 6851-E with the universal dual holder is a compact, portable machine designed to polish 3M Hot Melt Connectors for LAN applications. The universal dual holder allows for polishing of two ST, SC or FC PC connectors at once. See figure 1

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What is Multilayer Dielectric Thin-Film Filter?

A thin-film resonant cavity filter (TFF) is a Fabry-Perot interferometer, or etalon, where the mirrors surrounding the cavity are realized by using multiple reflective dielectric thin-film layers. This device acts as a bandpass filter, passing through a particular wavelength and reflecting all the other wavelengths. The wavelength that is passed through is determined by the cavity length. A thin-film resonant multicavity filter (TFMF) consists of two or more cavities separated by reflective dielectric thin-film layers, as shown in Figure 1 below. The effect of having multiple cavities on the response of the filter is illustrated in Figure 2 below. As

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What is AWG (Arrayed Waveguide Grating)?

>> What is AWG? A remarkable device that has been made using several planar-waveguide technologies and has found a variety of applications in WDM lightwave systems is the arrayed-waveguide grating, or AWG. Arrayed-waveguide gratings (AWG) are based on the principles of diffractions. An AWG device is sometimes called an optical waveguide, a waveguide grating router, a phase array, or a phasar. An AWG device consists of an array of curved-channel waveguides with a fixed difference in the length of optical path between the adjacent channels. An arrayed waveguide grating (AWG) is a generalization of the Mach-Zehnder interferometer. This device is

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