Advantages of SOA Assisted Extended Reach EADFB Laser (AXEL) for Operation at Low Power and with Extended Transmission Reach

Wataru KOBAYASHI  Naoki FUJIWARA  Takahiko SHINDO  Yoshitaka OHISO  Shigeru KANAZAWA  Hiroyuki ISHII  Koichi HASEBE  Hideaki MATSUZAKI  Mikitaka ITOH  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.10   pp.759-766
Publication Date: 2017/10/01
Online ISSN: 1745-1353
Type of Manuscript: INVITED PAPER (Joint Special Section on Opto-electronics and Communications for Future Optical Network)
Category: 
Keyword: 
electro-absorption modulator,  semiconductor optical amplifier,  DFB laser,  

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Summary: 
We propose a novel structure that can reduce the power consumption and extend the transmission distance of an electro-absorption modulator integrated with a DFB (EADFB) laser. To overcome the trade-off relationship of the optical loss and chirp parameter of the EA modulator, we integrate a semiconductor optical amplifier (SOA) with an EADFB laser. With the proposed SOA assisted extended reach EADFB laser (AXEL) structure, the LD and SOA sections are operated by an electrically connected input port. We describe a design for AXEL that optimizes the LD and SOA length ratio when their total operation current is 80mA. By using the designed AXEL, the power consumption of a 10-Gbit/s, 1.55-µm EADFB laser is reduced by 1/2 and at the same time the transmission distance is extended from 80 to 100km.