Patent ID: 8842963

Claim:
An optical fiber termination provided at an end of an optical fiber including one or more cores, comprising: a structure having a volume including an absorptive region of absorptive material provided to the end of the optical fiber that absorbs light emitted from each of the one or more cores to reduce reflections into the one or more cores to a return loss of −70 dB or less, wherein a length of the structure is less than 5 mm and a largest transverse dimension of the structure is less than 325 um, wherein the loss remains −70 dB or less, wherein the structure includes a material diffusion region formed from heating the end of the optical fiber together with a proximal portion of the absorptive region abutting the end of the optical fiber, a cross-section of the diffusion region including the absorptive material and a material of the optical fiber, wherein the optical fiber is associated with a first index of refraction and the absorptive region is associated with a second index of refraction, and wherein the diffusion region gradually transitions between the first index of refraction and the second index of refraction.