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

Regular Section

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

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Keywords: optical transmitter, lens-integrated DFB-LD, LD driver, 0.18-µm SiGe BiCMOS technology, pre-emphasis

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2016 Volume E99.C Issue 9 Pages 1039-1047

DOI https://doi.org/10.1587/transele.E99.C.1039

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Abstract

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.

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