Active phase tuning of DBR lasers
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United States of America Patent
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N/A
Issued Date -
Dec 5, 2002
app pub date -
Jun 4, 2001
filing date -
Jun 4, 2001
priority date (Note) -
Abandoned
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Abstract
A DBR laser includes at least one active phase shifting section, at least one gain section, and at least one Bragg section. The DBR laser is fine tuned by phase tuning the active phase shifting section of the DBR laser. Phase tuning the active phase shifting section by current injection provides a change in lasing wavelength opposite the change in lasing wavelength in response to tuning the Bragg section by current injection. This opposing change in wavelength reduces, and can eliminate, unwanted wavelength chirp due to crosstalk, thus improving laser performance by reducing the bit error rate (BER). Further, a DBR laser in accordance with the present invention is tunable without temperature tuning, thus providing much shorter transition times between desired wavelengths than possible with temperature tuning. Also, a DBR laser in accordance with the present invention can be operated at one temperature for all channels.
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