[[File: fiberferrulesandshrink.JPG|200 px|thumb|2x2mm square waveguide, ferrules, and heatshrink used to mount the ferrules onto the collars.]] | [[File: fiberferrulesandshrink.JPG|200 px|thumb|2x2mm square waveguide, ferrules, and heatshrink used to mount the ferrules onto the collars.]] |