Bandwith enhanced DFB+R lite laser
AssigneeII-Vi Delaware, Inc.
InventorsYasuhiro Matsui, Ashish Verma, Martin Kwakernaak
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.
Claims24
A distributed feedback plus reflection (DFB+R) laser, comprising:
- a distributed feedback (DFB) section having a first length between 60 to 150 microns and having a high reflection (HR) element;
- and
- a passive section coupled to the DFB section, the passive section having a second length between 30 to 80 microns and having a low reflection (LR) element opposite the DFB section, wherein the LR element occupies a subset of the second length with a portion of the passive section being between the LR element and the DFB section;
- wherein the DFB+R laser is directly modulated and is configured to operate uncooled;
- 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 and the lasing mode has only a single mode hop throughout a bias range of the passive section.
A method comprising:
- directly modulating a distributed feedback plus reflection (DFB+R) laser in uncooled operation;
- generating laser light in a distributed feedback (DFB) section of the DFB+R laser having a first length between 60 to 150 microns and having a high reflection (HR) element;
- coupling the laser light from the DFB section to a passive section having a second length between 30 to 80 microns and having a low reflection (LR) element, wherein the LR element occupies a subset of the second length with a portion of the passive section being between the LR element and the DFB section;
- 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 the 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 and such that the lasing mode has only a single mode hop throughout a bias range of the passive section.
Dependencies are inferred from the claim text.