A 50-Gb/s Optical Transmitter Based on a 25-Gb/s-Class DFB-LD and a 0.18-µm SiGe BiCMOS LD Driver

Takashi TAKEMOTO  Yasunobu MATSUOKA  Hiroki YAMASHITA  Takahiro NAKAMURA  Yong LEE  Hideo ARIMOTO  Tatemi IDO  

IEICE TRANSACTIONS on Electronics   Vol.E99-C   No.9   pp.1039-1047
Publication Date: 2016/09/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.1039
Type of Manuscript: PAPER
Category: Optoelectronics
optical transmitter,  lens-integrated DFB-LD,  LD driver,  0.18-µm SiGe BiCMOS technology,  pre-emphasis,  

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A 50-Gb/s optical transmitter, consisting of a 25-Gb/s-class lens-integrated DFB-LD (with -3-dB bandwidth of 20GHz) and a LD-driver chip based on 0.18-µm SiGe BiCMOS technology for inter and intra-rack transmissions, was developed and tested. The DFB-LD and LD driver chip are flip-chip mounted on an alumina ceramic package. To suppress inter-symbol interference due to a shortage of the DFB-LD bandwidth and signal reflection between the DFB-LD and the package, the LD driver includes a two-tap pre-emphasis circuit and a high-speed termination circuit. Operating at a data rate of 50Gb/s, the optical transmitter enhances LD bandwidth and demonstrated an eye opening with jitter margin of 0.23UI. Power efficiency of the optical transmitter at a data rate of 50Gb/s is 16.2mW/Gb/s.