Patent ID: 6252719
Filing Date: 2001-06-26
Classification: G02B,H04J

Abstract:
A beam splitter/combiner module operatively connectable to an optical fiber end and for at least one of multiplexing and demultiplexing a plurality of optical signals having at least three different wavelengths .lambda..sub.1, .lambda..sub.2, and .lambda..sub.3 traveling through the module, comprising:a first dichroic mirror constructed for one of low loss transmission and high reflectance of wavelengths including .lambda..sub.1 and .lambda..sub.2, and for another one of low loss transmission and high reflectance of wavelength .lambda..sub.3 ;a first collimating lens disposed between the optical fiber end and said first dichroic mirror for training signals between the optical fiber end and said first dichroic mirror;a second collimating lens disposed for training a first portion of said plurality of signals which is reflected by said first dichroic mirror;a second dichroic mirror disposed along an optical signal path defined between said first and said second dichroic mirrors for communicating optical signals along said signal path between said first dichroic mirror and said second dichroic mirror, said second dichroic mirror constructed for low loss transmission of wavelength .lambda..sub.1 so as to substantially transmit the signal having wavelength .lambda..sub.1 through said second dichroic mirror, and for high reflectance of wavelength .lambda..sub.2 so as to substantially reflect the signal having wavelength .lambda..sub.2 ;a third collimating lens disposed for training a second portion of said plurality of signals reflected by said second dichroic mirror; anda fourth collimating lens disposed for training a third portion of said plurality of signals transmitted by said second dichroic mirror.