OPTICAL MULTIPLEXER AND DEMULTIPLEXER FOR OPTICAL FIBERS WITH A LARGE NUMERICAL APERTURE

摘要

The invention relates to an optical multiplexer and demultiplexer comprising at least one input channel (2) for the connection of an input fiber (6), several output channels (3a-d) for the connection of output fibers (7a-d) and a beam divider unit (1) for dividing an incident optical beam on the input channel (2) onto output channels (3a-d) according to wavelength. An input lens system (4) is arranged on the input channel (2) in order to produce a parallel beam bundle from a beam exiting from the input fiber (6) and an output lens system (5a-d) is arranged on the output channels (3a-d) ein order to focus the parallel beam bundle exiting from the beam divider unit (1) onto the output fibers (7a-d). The input (4) and/or at least one of the output lens system (5a-d) comprise a lens combination made up of at least one positive lens (8) and an achromatic lens (9) which are configured for correcting aberrations of the incoming beam. Optical fibers with a high numerical aperture can be used with said optical multiplexer/demultiplexers with low attenuation and high channel cross- talk attenuation.