Patent ID: 11936428
Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC H

Claim 12:
13. The optical device according to claim 12, wherein
cores of the second optical waveguide at the leading stage, the second optical waveguide at the middle stage, the second optical waveguide at the trailing stage, the first branching unit, the second branching unit, the first multiplexing unit, and the second multiplexing unit are
in the amorphous state, and
cores of the two first optical waveguides on the forward path side at the leading stage, the two first optical waveguides on the backward path side at the leading stage, the two first optical waveguides on the forward path side at the trailing stage, the first optical waveguide on the backward path side at the trailing stage, the input unit, and the output unit are
in the non-amorphous state.