US 7,430,348 B2
Four-port optical filter fabricated from tapered optical fiber
Timothy Eugene Dimmick, Oviedo, Fla. (US); Kevin Randolph Harper, Palm Bay, Fla. (US); and Douglas James Markos, West Melbourne, Fla. (US)
Assigned to Harris Corporation, Melbourne, Fla. (US)
Filed on Oct. 05, 2006, as Appl. No. 11/538,957.
Application 11/538957 is a continuation of application No. 11/226833, filed on Sep. 14, 2005, granted, now 7,177,503.
Prior Publication US 2007/0154139 A1, Jul. 05, 2007
Int. Cl. G02B 6/26 (2006.01); H01S 3/08 (2006.01)
U.S. Cl. 385—30  [385/32; 372/94] 13 Claims
OG exemplary drawing
 
1. An optical device, comprising:
a first optical fiber having a first end, a second end and a tapered portion located between said first and second ends, said tapered portion being formed in a substantially 180° first loop so that said first and second ends are oriented generally parallel to one another;
a second optical fiber having a first end, a second end and a tapered portion located between said first and second ends, said tapered portion being formed in a substantially 180° second loop so that said first and second ends are oriented generally parallel to one another;
said first loop and said second loop being positioned relative to one another to collectively form a ring resonator,
optical power propagating within one of said first and second optical fibers being input to said ring resonator by evanescent field coupling, said optical power completing a circuit within said ring resonator by transitioning between said first loop and said second loop at two points of coupling.