Low temperature distributed feedback laser with loss grating and method
US6828166B2 · kind B2 · utility
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22Claims
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Key dates
| Filing date | Sep 6, 2002 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Sep 18, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/1039
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A low threshold distributed feedback (DFB) laser is constructed for improved performance at subzero temperatures. A loss grating is employed to enhance the probability that lasing occurs near the short wavelength side of the stopband and to counteract the effect of negative gain tilt that occurs when DFB lasers are positively detuned. A method of making DFB lasers from wafers with improved yield for low temperature side mode suppression ratio (SMSR) is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.