same band combiners company is a kind of optical device used to reduce optical power, is also one of the optical passive devices, divided into variable same band combiners company and fixed same band combiners company two kinds. This paper introduces the principle and structure of the same band combiners company.

The same band combiners company is divided into coupling type, reflection type and absorption type according to the principle of optical power attenuation. Coupling type same band combiners company by controlling the input, output beam alignment deviation to change the optical coupling quantity, has achieved the purpose of changing the attenuation. The same band combiners company of launch type is to make attenuation film by gilding reflection film on the surface of glass substrate, and change the emission amount by controlling the thickness of the emission film, so as to obtain different attenuation amount. It is used to place the attenuator at an Angle with the optical axis to reduce the influence of reflection on stability. Absorption-type attenuators use optical absorption to make attenuators, by changing the composition and thickness of the absorption to change the absorption amount, so as to get different attenuation amount.

The common structure of the same band combiners company includes optical components and attenuators. The input optical signal is transformed into a parallel beam through the self-focusing lens, and the parallel beam is then sent to the self-focusing lens to be coupled to the output fiber through the attenuator plate. If the entire attenuator plate has different attenuators at different positions, The same band combiners company can be made by using a certain adjusting structure (such as rotary structure) to let the input light incident at different locations. Variable same band combiners company's main technical indicators include burnout range, burnout repeatability and original insertion loss. The combination of two built-in metal reflective film attenuators provides an adjustment capacity of approximately 60db.

Fixed same band combiners company is usually made in the form of movable connectors for easy connection to fiber optic lines. In addition to the structure of the attenuation plate mentioned above, the fixed attenuation can be obtained by plating a metal film with a certain thickness on the optical fiber end face and setting an air gap of a few microns on the optical path.

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