Optical transmitter having a widely tunable directly modulated laser and periodic optical spectrum reshaping element
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United States of America Patent
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Jun 14, 2011
Grant Date -
Jul 10, 2008
app pub date -
Dec 26, 2007
filing date -
Dec 22, 2006
priority date (Note) -
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Abstract
An optical transmitter is disclosed including a widely tunable laser coupled to a periodic optical spectrum reshaper (OSR) to convert frequency modulated pulses from the laser into amplitude modulated pulses. The laser is tuned to generate pulses corresponding to passbands of the OSR spanning a wide range of frequencies. The laser includes a gain section having an optical path length substantially shorter than the total optical path length of the laser. The laser may be a Y-branch laser having reverse-biased sampled gratings or ring resonator filters tuned by stripe heaters. The laser may also include a reflective external cavity section tunable by modulating the temperature of ring resonators or etalons. The OSR may be integrally formed with the external cavity of the ECL laser.
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