公开(公告)号：US20190319427A1

公开(公告)日：2019-10-17

申请号：US16436573

申请日：2019-06-10

Applicant: Cisco Technology, Inc.

Inventor： Matthew J. TRAVERSO ,  Dominic F. SIRIANI ,  Mark WEBSTER

IPC: H01S5/12 ,  H01S5/125 ,  G02B6/12 ,  H01S5/10 ,  H01S5/022 ,  H01S5/028

Abstract: The embodiments herein describe a single-frequency laser source (e.g., a distributed feedback (DFB) laser or distributed Bragg reflector (DBR) laser) that includes a feedback grating or mirror that extends along a waveguide. The grating may be disposed over a portion of the waveguide in an optical gain region in the laser source. Instead of the waveguide or cavity being linear, the laser includes a U-turn region so that two ends of the waveguide terminate at the same facet. That facet is coated with an anti-reflective (AR) coating.