Routing band-pass filter for routing optical signals between multiple optical channel sets

A method of manufacturing a wavelength-division multiplexing (WDM) optical assembly configured to direct multiplexed signals, comprising:

• positioning a first routing filter on a substrate, the first routing filter having a first routing passband for routing the multiplexed signals into a first primary routing optical path and a first secondary routing optical path, the first primary routing optical path being for signals outside the first routing passband, and the first secondary routing optical path being for signals within the first routing passband,
• positioning a first optical subassembly for routing signals of the first primary routing optical path, the first optical subassembly comprising a plurality of first WDM filters and at least one first primary reflective surface, wherein:
• the plurality of first WDM filters each has a unique passband to allow signals of the first primary routing optical path that are within the unique passband to pass through the associated first WDM filter,
• the at least one first WDM filter is configured to reflect signals of the first primary routing optical path that are not within the first passband toward the at least one first primary reflective surface;
• and
• the at least one first primary reflective surface is configured to redirect any signals of the first primary routing optical path that are received from each of the first WDM filters to a different one of the first WDM filters;
• and
• positioning a second optical subassembly for routing signals of the first secondary routing optical path, the second optical subassembly comprising a plurality of second WDM filters and at least one first secondary reflective surface, wherein:
• the plurality of second WDM filters each has a unique passband to allow signals of the first secondary routing optical path that are within the unique passband to pass through the associated second WDM filter,
• the at least one second WDM filter is configured to reflect signals of the first secondary optical path that are not within the second passband toward the at least one first secondary reflective surface;
• and
• the at least one first secondary reflective surface is configured to redirect any signals of the first secondary routing optical path that are received from each of the second WDM filters to a different one of the second WDM filters.

A wavelength-division multiplexing (WDM) device configured to direct multiplexed signals, comprising:

• a housing;
• a common collimator positioned within the housing;
• a common fiber optic pigtail operatively coupled to the first common collimator and extending from the housing;
• a first group of channel collimators positioned within the housing and each having a channel fiber optic pigtail extending from the housing;
• a second group of channel collimator positioned within the housing and each having a channel fiber optic pigtail extending from the housing;
• and
• a wavelength-division multiplexing (WDM) optical assembly, comprising:
• a first routing filter having a first routing passband for routing the multiplexed signals from the common collimator into a first primary routing optical path and a first secondary routing optical path, the first primary routing optical path being for signals outside the first routing passband, and the first secondary routing optical path being for signals within the first routing passband,
• a first optical subassembly for routing signals of the first primary routing optical path to the first group of channel collimators, the first optical subassembly comprising a plurality of first WDM filters and at least one first primary reflective surface, wherein:
• the plurality of first WDM filters each has a unique passband to allow signals of the first primary routing optical path that are within the unique passband to pass through the associated first WDM filter to a corresponding channel collimator of the first group of channel collimators,
• the at least one first WDM filter is configured to reflect signals of the first primary routing optical path that are not within the first passband toward the at least one first primary reflective surface;
• and
• the at least one first primary reflective surface is configured to redirect any signals of the first primary routing optical path that are received from each of the first WDM filters to a different one of the first WDM filters;
• and
• a second optical subassembly for routing signals of the first secondary routing optical path to the second group of channel collimators, the second optical subassembly comprising a plurality of second WDM filters and at least one first secondary reflective surface, wherein:
• the plurality of second WDM filters each has a unique passband to allow signals of the first secondary routing optical path that are within the unique passband to pass through the associated second WDM filter to a corresponding channel collimator of the second group of channel collimators,
• the at least one second WDM filter is configured to reflect signals of the first secondary optical path that are not within the second passband toward the at least one first secondary reflective surface;
• and
• the at least one first secondary reflective surface is configured to redirect any signals of the first secondary routing optical path that are received from each of the second WDM filters to a different one of the second WDM filters.