NDLI: An Ultrahigh-Speed Low-Power DAC Using InP HBTs for Multi-Level Optical Transmission Systems

Content Provider	IEEE Xplore Digital Library
Author	Nagatani, M. Nosaka, H. Yamanaka, S. Sano, K. Murata, K.
Copyright Year	2010
Abstract	This paper presents an ultrahigh-speed low-power digital-to-analog converter (DAC) for multi-level optical transmission systems. To achieve both high-speed and low-power operation, we used a simple R-2R ladder-based current-steering architecture and devised a timing alignment technique. The 6-bit DAC test chip was fabricated with our InP HBT technology, which yields a peak ft of 175 GHz and a peak fmax of 260 GHz. The measured differential and integral non-linearity (DNL and INL) are within +0.68/-0.16 LSB and +0.17/-0.68 LSB, respectively. The measured spurious-free dynamic range (SFDR) remains above 36 dB up to the Nyquist frequency at a sampling rate of 13.5 GS/s, which was the limit of our measurement setup. The expected linear ramp-wave outputs at a sampling rate of 27 GS/s are also obtained. The DAC chip was assembled into a metal package for use in an optical transmission experiment, where it provides a clear 4-level signal for 16-QAM optical transmission at a sampling rate of up to 28 GS/s. The DAC consumes only 0.95 W and has a better figure of merit (FOM) (0.53 pJ) than any other previously reported DAC with a sampling rate above 20 GS/s. Our DAC module can also be applied to beyond-100-Gb/s/ch multi-level optical transmission systems.
Starting Page	1
Ending Page	4
File Size	650910
Page Count	4
File Format	PDF
ISBN	9781424474370
ISSN	15508781
e-ISBN	9781424474387
e-ISBN	9781424474363
DOI	10.1109/CSICS.2010.5619606
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	High speed optical techniques Optical transmitters Optical device fabrication Indium phosphide Heterojunction bipolar transistors Integrated optics Optical modulation
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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