| 摘要 |
FIELD: electric coupling. ^ SUBSTANCE: can be used within bidirectional optical coupling systems. Bidirectional optical coupler contains first and second transmitter-receiver signal centres, every of which is equipped with transmitter-receiver optical system including receiving plot with at least two collecting lenses and on the opposite side with concatenated along each collecting lens optical axis as follows: focusing objective lens, deflecting mirror coupled with respective collecting lens and coupling signal transmitter or coupling signal receiver, position-sensitive photodetector or laser. Coupling signal transmitter and coupling signal receiver are designed as light guide ends of diameter d and numerical aperture NA. Reflecting surface of deflecting mirror is coated with dichroic surface to provide reflected transmission of wave length lambda1 and advanced transmission of wave length lambda2 Coupling signal transmitter and receiver provide performance at wave length lambda1. Laser and position-sensitive photodetector provide performance at wave length lambda2. Laser of each transmitter-receiver signal centre is coupled with position-sensitive photodetector of counter transmitter-receiver signal centre, while each position-sensitive photodetector is electrically coupled with average power controller of coupling signal transmission of given transmitter-receiver signal centre. Receiving plot is fixed with supporting arm which from its side is connected to transmitter-receiver signal centre base with flat elastic plate, yet from the opposite side supporting arm is furnished with rests set against two transversely-spaced linear devices (actuators), supported by a transmitter-receiver signal centre base. Focusing objective lens consists of negative and positive lenses. Positive lens is coupled with receiving plot by fastener made of material with linear thermal expansion coefficient alpha1. Negative lens is coupled with receiving plot by fastener made of material with linear thermal expansion coefficient alpha2. Laser and position-sensitive photodetector are coupled with positive and negative lenses. Light guide ends are coupled with receiving plot by fastener made of material with linear thermal expansion coefficient alpha2. Specified linear thermal expansion coefficients of fasteners are related by ratio as follows: , where: L - distance between collecting lens and coupled light guide end; F3 - positive lens focus of focusing objective lens; DeltaT - permissible range of operating temperature. ^ EFFECT: improved performance of bidirectional optical coupler. ^ 8 dwg |
