Fiber attenuator as a light passive device for optical communication system which debug optical power performance, debugging fiber optic instrument calibration correction, fiber signal attenuation. Fiber Optic Attenuator The product is made of attenuating optical fibers with metal ions, which adjusts the optical power to the desired level.
First, according to the type of port can be divided into the following categories:
SC fiber attenuator: used in SC fiber interface, it looks very similar with the RJ-45 interface, but the SC interface is more flat, the obvious difference is inside the contact, if it is 8 fine copper contacts, then Is RJ-45 interface, Fiber Optic Attenuator if it is a copper column is SC fiber interface.
LC fiber attenuator: used in LC fiber interface, connected to the SFP module connector, Fiber Optic Attenuator which uses a convenient modular jack (RJ) latch mechanism made. (Commonly used by routers)
FC fiber attenuator: used in FC fiber interface, external reinforcement is the use of metal sets, fastening for the screw buckle. Generally used in the ODF side (the most used on the patch panel)
ST fiber attenuator: used in ST fiber interface, commonly used in fiber patch panels, shell was round, fastening way for the screw buckle. (For 10Base-F connections, the connector is usually of type ST. Fiber Optic Attenuator Commonly used in fiber patch panels)
Second, the working principle
1, air isolation technology
Light transmission in the fiber by the total reflection of the law constraints, can not be scattered out to maintain the strength of the relatively stable. And once it is separated from the fiber, in the fiber and fiber to join the air between the interval, the light will be scattered out, causing light attenuation. As the light from the ordinary fiber into the air scattering is very strong, so to control the attenuation of a certain range, we must ensure that the isolation distance and maintain the alignment of the two ends of the fiber. Through this principle can be made flange fixed attenuator and adjustable attenuator. Flange fixed attenuator using isolation attenuator, according to the curve to produce a certain thickness of the attenuation film, Fiber Optic Attenuator the attenuation film implanted in the flange, can play a fixed light attenuation effect. Flange type adjustable optical attenuator using mechanical rotation principle, through the mechanical rotation to adjust the distance between the two ends of the connector can make the light attenuation between 0 ~ 30dB.
2, displacement dislocation technology, this method is the two fiber core of the micro-shift misalignment, Fiber Optic Attenuator so as to achieve the effect of power loss.
Through the use of ordinary pigtail, with the welding machine to the two pigtail core in the case of dislocation welding work, so that the optical transmission in the process of partial core loss, the connector-type fixed attenuator, also known as on-line fixed attenuator The
3, attenuation of fiber technology, according to the metal ions on the absorption of light, developed a mixed metal ion attenuation fiber, and ordinary fiber attenuation coefficient per kilometer, this attenuation fiber also has a fixed attenuation coefficient, but this attenuation The coefficient is not calculated in kilometers, Fiber Optic Attenuator but in millimeters. Will the attenuation of fiber into the ceramic ferrule? After a special process? Can be made of yin-yang fixed attenuator.