DFB with weak optical feedback
AssigneeII-Vi Delaware, Inc.
InventorYasuhiro Matsui
Life of this patent
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Abstract
A distributed feedback plus reflection (DFB+R) laser includes an active section, a passive section, a low reflection (LR) mirror, and an etalon. The active section includes a distributed feedback (DFB) grating and is configured to operate in a lasing mode. The passive section is coupled end to end with the active section. The LR mirror is formed on or in the passive section. The etalon includes a portion of the DFB grating, the passive section, and the LR mirror. The lasing mode of the active section is aligned to a long wavelength edge of a reflection peak of the etalon.
Claims18
A distributed feedback plus reflection (DFB+R) laser, comprising:
- a distributed feedback (DFB) section;
- a passive section coupled to the DFB section and having a low reflection (LR) element;
- wherein a portion of the DFB section, the passive section, and the LR element form an etalon having a reflection profile with periodic peaks and valleys, and
- wherein the DFB section is configured to operate in a lasing mode aligned to a long wavelength edge of one of the periodic peaks of the reflection profile of the etalon, wherein the passive section is configured to impart a phase shift of about 20 degrees to light propagating in the DFB+R laser;
- and/or wherein a length of the passive section is in a range from 100 micrometers to 250 micrometers.
A method comprising:
- generating laser light in a distributed feedback (DFB) section of a laser;
- coupling the laser light from the DFB section to a passive section having a low reflection (LR) element;
- resonating the laser light in an etalon formed by a portion of the DFB section, the passive section, and the LR element, the etalon having a reflection profile with periodic peaks and valleys, and
- operating DFB section in a lasing mode aligned to a long wavelength edge of one of the periodic peaks of the reflection profile of the etalon, wherein resonating the laser light in the etalon comprises imparting a phase shift with the passive section of about 20 degrees to the laser light.
Dependencies are inferred from the claim text.