Patent ID: 7277612
Filing Date: 2007-10-02
Classification: G02B,H01S

Abstract:
1. Optical apparatus comprising: a pump guiding fiber comprising a fiber cladding, a fiber core and an attachment section, said attachment section comprising a straight core section and a tapered core section; and a receiving fiber comprising an inner clad to which said straight core section and said tapered core section of said attachment section are attached, wherein a divergence angle of light in said pump guiding fiber αs, and a light acceptance angle of said inner clad of said receiving fiber, αf, satisfy the following relation: wherein k is a constant equal or smaller than 1, wherein said pump guiding fiber is attached to said receiving fiber only at said straight core section and said tapered core section, and wherein a length of said straight core section that is attached to said receiving fiber is at least as long as a length of said tapered core section that is attached to said receiving fiber.