Patent ID: 7295730
Filing Date: 2007-11-13
Classification: G02B

Abstract:
1. An optical filter device for filtering a wave division multiplexed signal, the filter comprising: a glass housing comprised of a plurality of glass tubes; a first D-lens, positioned within the glass housing, that optically interfaces with a first fiber pigtail and focuses an incident light beam from the first fiber pigtail; a WDM filter, positioned within the glass housing and relative to the first D-lens, that receives the focused incident light beam and passes at least one wavelength within the incident light beam; a second D-lens, positioned within the glass housing, that focuses the filtered light beam having the at least one wavelength into at least one transmission port in fiber pigtail; and wherein the first D-lens and the WDM filter are separated by a gap of approximately 0.25 millimeters.