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A novel way to improve the dispersion-limited transmission distance of electroabsorption modulated lasers

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5 Author(s)
Hoon Kim ; Telecommun. R&D Center, Samsung Electron. Co., Kyunggi-Do, South Korea ; Sung Kee Kim ; Hanlim Lee ; Seongtaek Hwang
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We propose and demonstrate a way to improve the dispersion-limited reach of electroabsorption modulated lasers (EMLs). We generate continuous-phase frequency-shift keying/amplitude-shift keying (ASK) signals with the EML by applying a small current modulation to the laser diode (LD) on top of electroabsorption-modulated ASK signals. The amount of frequency deviation induced by the current modulation is adjusted to have the EML output signals experience π phase shift at every space. The experimental demonstration shows that with the proposed scheme we can increase the dispersion-limited transmission distance of the EML-based transmitter by 25%-75%, and it can be further improved by employing an LD with flat frequency-modulation response.

Published in:

Photonics Technology Letters, IEEE  (Volume:18 ,  Issue: 8 )