Patent ID: 9023677
Filing Date: 2015-05-05
Classification: G02B,H01L,Y02E

Abstract:
1. A method for producing a spot size converter comprising the steps of: preparing a substrate including a main surface having a first area, a second area, a third area, and a fourth area that are arranged in a direction of a waveguide axis; forming a stacked semiconductor layer disposed on the main surface of the substrate; forming a first insulator mask on the stacked semiconductor layer; forming a substrate product including a first terrace, a second terrace, and a waveguide mesa disposed between the first terrace and the second terrace by etching the stacked semiconductor layer using the first insulator mask, the first terrace having a first terrace portion, a second terrace portion, a third terrace portion, and a fourth terrace portion that are respectively disposed on the first area, the second area, the third area, and the fourth area, the second terrace having a fifth terrace portion, a sixth terrace portion, a seventh terrace portion, and an eighth terrace portion that are respectively disposed on the first area, the second area, the third area, and the fourth area, the waveguide mesa having a first mesa portion, a second mesa portion, a third mesa portion, and a fourth mesa portion that are respectively disposed on the first area, the second area, the third area, and the fourth area; forming a second insulator mask on the substrate product, the second insulator mask including a first pattern disposed on the first terrace portion, a second pattern disposed on the fifth terrace portion, a third pattern disposed on the third mesa portion and the fourth mesa portion, and a fourth pattern that integrally covers a region extending from the fourth terrace portion to the eighth terrace portion through the fourth mesa portion; and selectively growing a semiconductor layer on the substrate product by using the second insulator mask.