Optical communications – Transmitter – Including specific optical elements
Reexamination Certificate
2011-04-12
2011-04-12
Pascal, Leslie (Department: 2613)
Optical communications
Transmitter
Including specific optical elements
C398S185000, C398S186000, C398S187000, C398S194000
Reexamination Certificate
active
07925172
ABSTRACT:
An optical transmitter is disclosed wherein a directly modulated laser outputs a frequency modulated signal through a semiconductor optical amplifier. Both the optical transmitter and semiconductor amplifier are modulated according to an output of a digital data source. An optical filter is positioned to receive an output of the semiconductor optical amplifier and has a frequency dependent transmission function effective to convert the amplified signal into a filtered signal having enhanced amplitude modulation. In some embodiments, the semiconductor optical amplifier is coupled to the digital data source by means of a compensation circuit configured to high-pass filter the output of the digital signal source. In other embodiments, the semiconductor optical amplifier is coupled to the digital data source by means of a compensation circuit configured to produce an output including a first-order time derivative of the output of the digital signal source.
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Mahgerefteh Daniel
Olsson Nils Anders
Finisar Corporation
Maschoff Gilmore & Israelsen
Pascal Leslie
LandOfFree
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