US 11,808,970 B2
Optical fiber with variable absorption
Vincent Petit, Cupertino, CA (US); and Martin H. Muendel, Oakland, CA (US)
Assigned to Lumentum Operations LLC, San Jose, CA (US)
Filed by Lumentum Operations LLC, San Jose, CA (US)
Filed on Nov. 12, 2021, as Appl. No. 17/454,709.
Application 17/454,709 is a continuation in part of application No. 16/657,070, filed on Oct. 18, 2019, granted, now 11,175,449, issued on Nov. 16, 2021.
Claims priority of provisional application 62/787,555, filed on Jan. 2, 2019.
Prior Publication US 2022/0077643 A1, Mar. 10, 2022
Int. Cl. G02B 6/02 (2006.01); H01S 3/067 (2006.01); C03B 37/027 (2006.01); C03B 37/012 (2006.01)
CPC G02B 6/02295 (2013.01) [C03B 37/01211 (2013.01); C03B 37/027 (2013.01); C03B 37/02763 (2013.01); G02B 6/02376 (2013.01); H01S 3/06716 (2013.01); H01S 3/06745 (2013.01); C03B 2201/10 (2013.01); C03B 2201/12 (2013.01); C03B 2201/28 (2013.01); C03B 2201/31 (2013.01); C03B 2203/20 (2013.01); C03B 2203/22 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An optical fiber, comprising:
a core doped with one or more active ions to guide signal light from an input end of the optical fiber to an output end of the optical fiber;
a cladding surrounding the core to guide pump light from the input end of the optical fiber to the output end of the optical fiber; and
one or more inserts formed in the cladding surrounding the core,
wherein the core has a geometry that varies along a longitudinal length of the optical fiber, and
wherein the geometry of the core is varied along the longitudinal length of the optical fiber to cause an absorption of the pump light to be modulated along the longitudinal length of the optical fiber,
wherein the geometry of the core that varies along the longitudinal length of the optical fiber comprises a cross-sectional size of the core that increases from the input end to the output end of the optical fiber.