In fiber-optic networks, either by temporarily adding a calibrated amount of signal loss to test power level margins or to match transmitter and receiver levels accurately installed permanently, a fiber optical attenuator is commonly used. Stress optic fibers get bend by sharp and can cause losses. Wrapping the cable around a pencil is a temporary fix until the needed attenuation level is achieved only if a strong signal is received.
Principles of operation
The working of the Fiber Optical attenuator is performed only by absorbing the light like sunglasses consume extra light energy. A working wavelength range is present in fiber collimator which absorbs all light energy equally. In an air gap, they should not reflect the light or scatter the light since in the fiber system it can cause unwanted back reflection.
Types of Fiber Optical attenuators
In MU, SC, ST, FC, LC, E2000 style with APC and UPC polish fixed fiber optic attenuators is available. Generally, like the multimode sources multimode systems do not need attenuators and to saturate receivers VCSELs, rarely have enough power output. Instead, short links single-mode systems, often have too much power and require attenuators. So, attenuators are generally single-mode types. The commonly used model is LC single-mode female to male and female to female fixed fiber optic attenuator. The female to female fixed fiber optic attenuators has female type fiber optic adapter at both ends unlike the common female to the male type mentioned above, which are also referred to as fiber-optic adapter type attenuators. They can be simultaneously used as adapters and attenuators.
Fixed Attenuators
A variety of principles may be used by the working fixed optical attenuators in fiber optic systems. By preferred attenuators, doped fibers, misaligned splices, or total power are used as these are cheap and reliable. Into patch cables, optical isolator is incorporated. Build-out style attenuator being an alternative is a small male-female adapter that can be included in other cables.
コリメーション接眼レンズ 光軸修正 望遠鏡コリメータ ショートタイプ コリメーションアイピース
SOLOMARK 光軸調整アイピース コリメーターニュートン望遠鏡用ロングタイプ 光軸修正アイピース 31.7mm径 コリメーション・アイピース (ショート)
SVBONY レッドレーザーコリメーター Newtonian Marca 望遠鏡アライメント 1.25インチ 7段階の明るいレベル トリプルセメントレンズ 2インチアダプター付き
Astromania線形1.25 "次世代Laser Collimator for Newtonian望遠鏡
望遠鏡レーザーコリメーター 1.25インチ Bysameyee キャリブレーター 2インチアダプター付き ニュートン反射望遠鏡コリメーション用 レーザーコリメーター用
Gap loss or reflective principles are frequently used by non-preferred attenuators. To vibration, temperature, contamination, and wavelength, such devices are sensitive usually. Reflections and signal dispersion may be caused by damage due to power bursts.
