The china dual band combiner is an optical device used to reduce optical power. It is also one of the optical passive devices. The combiner is divided into variable china dual band combiner and fixed china dual band combiner. This section describes the principle and structure of the china dual band combiner.

china dual band combiner is divided into coupling type, reflection type and absorption type according to the principle of optical power attenuation. The coupled china dual band combiner changes the optical coupling by controlling the alignment deviation of the input and output beams, which has achieved the purpose of changing the attenuation. Emission china dual band combiner is made of a reflective film gilded on the surface of the glass substrate to make an attenuator. The emission amount is changed by controlling the thickness of the emission film, so as to obtain different attenuation amounts. The use is 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, and change the absorption amount by changing the composition and thickness of the absorption, so as to obtain different attenuation amounts.

The common china dual band combiner structure includes an optical component and an attenuator. The input light signal is transformed into a parallel beam through the self-focusing lens, and then the parallel beam is coupled to the output fiber through the self-focusing lens through the attenuator plate. If the entire attenuator plate has different attenuation amounts at different positions, The adjustable china dual band combiner can be made by adopting a certain adjustment structure (such as a rotating structure) to let the input light incident at different positions. The main technical specifications of the variable china dual band combiner include loss range, loss repeatability and original insertion loss. The combination of two built-in metal reflective film attenuators provides an adjustment capacity of approximately 60db.

The fixed china dual band combiner is usually configured with a movable connector for easy connection to an optical fiber. In addition to the structure of the damping plate, a metal film with a certain thickness is plated on the end face of the optical fiber according to the requirements, and an air gap of a few microns is set on the optical path to obtain a fixed attenuation.

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