Description Of An Attenuator Fiber Optics SMA Variable Device
The attenuator fiber optics sma variable is a fiber optic attenuator designed to reduce signal power in fiber optic links by inducing a fixed or variable loss. This attenuator has variable SubMiniature version A (SMA) connector. The attenuator controls the power level of optical signals at the outputs of electric-to-optical converters and light sources. A fiber optic attenuator is required in several applications including in cable television and in optical communication networks such as fiber optic telephone networks. The attenuator fiber optics sma variable is also used to test the dynamic range and linearity of photo sensors and photo detectors.
An SMA connector is described as coaxial radio frequency (RF) connector. It was developed in the 1960s as a minimal connector interface designed for coaxial cable. An SMA connector offers excellent electrical performance from direct current (DC) to 18 GHz although some proprietary versions are rated to 26.5 GHz. An SMA connector comprises a 0.250x36 thread, with the male being equipped with a .312 inch hex nut. In a conventional SMA connector, the male connector is also known as the plug while the female connector is also referred to as socket or jack. The outer shell of the male connector features an inside thread and an inner pin. An SMA connector is made from polytetrafluroethylene dielectric material which will contact along the mating plane. This connector allows quick connection and can be used in both alternating current and direct current applications.
In general, there are two types of fiber attenuators: the fixed and variable attenuators. These attenuator fiber optics sma variable devices may have either single mode or multimode cables. A fixed attenuator is a device designed to attenuate a signal’s power levels by a fixed amount with little or no reflection at all. The output signal is attenuated relative to the input signal while the output and input impedance is maintained close to 50 ohms over the specified bandwidth. Because of this characteristic, a fixed attenuator is commonly used to enhance interstage matching in an electronic circuit. Fixed attenuators in circuits are also designed to lower voltage.
In the variable attenuator, solid state technologies such as PIN diodes and metal semiconductor field effect transistors (MESFETs) replace the resistors. By controlling the electric current across the diode or the electric potential difference across the FET, the attenuator becomes rf variable, which means that the device’s radio frequency resistances are infinitely varied. For variable attenuator applications which require an octave bandwidth or less, the reflection or unbalanced attenuators are recommended because only one resistor value is necessary. The resistive element will be realized using NIP or PIN diodes. Meanwhile, a microstrip Lange or a stripline broadside coupler will be used for the quadrature coupler. In these applications, the voltage/current characteristics of the diodes should be matched so that they will have the same impedance. Some of the major companies which manufacture attenuator fiber optics sma variable devices include Anritsu Corp., Boston Applied Technologies, OptiWorks Inc., Timbercon Inc., Pacific Interconnections LLC and Pasternack Enterprises Inc.
