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Possible Application of Flash-Type SFQ A/D Converter to Optical Communication Systems and Their Measuring Instruments.
- Source :
-
IEEE Transactions on Applied Superconductivity . Jun2009 Part 1 of 3, Vol. 19 Issue 3, p611-616. 6p. 1 Chart, 1 Graph. - Publication Year :
- 2009
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Abstract
- We propose a possible application of a high-speed flash type single flux quantum (SFQ) analogue-to-digital converter (ADC) to optical communication systems and their measuring instruments. One of the problems in optical networks is the chromatic dispersion over a standard single mode fiber, which has to be recovered by optical dispersion compensation. Recently, there has been great interest in 100-Gbit/s Ethernet technologies as next generation optical networks in which chromatic dispersion is more severe. Among several types of architectures, digital coherent optical communication system is a promising technology. Correction of the dispersion is performed electrically after digital conversion without any optical compensation, which would ease system construction. Digital storage oscilloscopes with high-speed ADCs are crucial for investigating the architecture and for constructing 100-GbE systems. A flash-type SFQ ADC is attractive for its high-speed sampling clock capability, especially as an instrument for a digital coherent receiver. The maximum operating frequency of the comparator in ADCs was studied by simulation for various critical current densities (Jo). The simulation suggested that using Jc of 20-40 kA/cm2 enables the comparator to operate at a clock frequency of more than 100 GHz. An O/E converter, a uni-traveling-carrier photodiode, operable at low-temperature, has been developed and 40-GHz operation was confirmed at 5 K. We have also designed a 1-bit slice of a superconducting quantum interference device-(SQUID) wheel-type ADC and its test circuit including a doubler circuit and two driver types. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10518223
- Volume :
- 19
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Applied Superconductivity
- Publication Type :
- Academic Journal
- Accession number :
- 43868774
- Full Text :
- https://doi.org/10.1109/TASC.2009.2018034