Isolators, light source devices, optical transmitters, optical switches, optical amplifiers, and data centers

摘要

PROBLEM TO BE SOLVED: To provide an isolator, a light source device, an optical transmitter, an optical switch, an optical amplifier, and a data center which are easily miniaturized. An isolator includes a first waveguide and a second waveguide that are located along a substrate surface and overlap each other when viewed from the substrate on a substrate having a substrate surface. The first waveguide and the second waveguide have a core and a cladding, respectively. The core has a first surface facing the substrate surface side and a second surface opposite the first surface. The clad is located so as to be in contact with the first and second surfaces of the core. The first waveguide has a first end and a second end, and each of the first end and the second end has a port for input / output of electromagnetic waves. The core of the second waveguide contains a non-reciprocal member in at least a part of the cross section intersecting in the extending direction of the second waveguide, and has an aspect ratio of 0.8 to 1.2. [Selection diagram] Fig. 1