Optical filter assembly e.g. dense wavelength division multiplexing filter for optical information transmission system, has optical filter and a reflective optical filter that are having reduced group dispersion

摘要

A holder (4) holds an optical filter (2) and a reflective optical filter (3) that are having reduced group dispersion. Collimators (5,10) having GRIN lenses (8,11) provide confocal propagation path for optical signals transmitted through the filters. Independent claims are included for the following: (1) Optical information processing system; and (2) Optical information transmission system.