| 摘要 |
A Variable Optical Attenuation Collimator (VOAC) with a controllable mechanism and of improved optical performance is disclosed to achieve a low IL, a low PDL, a high RL, a low PMD, a low WDL and a high maximum level of input light power by adding a transparent micro lens to the Attenuation Control Element (ACE) that is disposed between a lens element and fiber pigtails of a traditional fiber optical collimator. The micro lens functions to redirect the blocked light power substantially out of the main light path without any significant absorption of the blocked light power. The micro lens can be made of any kind of transparent optical materials such as a cured drop of an epoxy, glass or transparent polymer. When the micro lens diameter is properly selected the improved optical performance is achieved for the VOAC.
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