Title :
High-Order Multi-Level Optical Transmission for beyond 100 Gb/s Using High-Speed DACs
Author :
Yamanaka, Shogo ; Kobayashi, Takayuki ; Nagatani, Munehiko
Author_Institution :
Network Innovation Labs., NTT Corp., Yokosuka, Japan
Abstract :
This paper describes high-speed and high-spectral efficiency optical transmission technologies that focus on channel rates beyond 100 Gb/s. Quadrature amplitude modulation (QAM) is adopted to achieve high spectral efficiency. First, we review recent progress in optical QAM transmission technologies. High-speed digital-to-analog converters (DACs) are key components for generating optical QAM signals. We recently developed a high-speed DAC fabricated by indium phosphide (InP) heterojunction bipolar transistors (HBTs) technology. It has a resolution of 6 bits and operates at up to 28 Gs/s. We performed a 25 GHz-spaced eleven-channel 171 Gb/s 16-QAM transmission experiment using our DAC. We achieved the record spectral efficiency-distance product of 9216 b/s/Hz-km (6.4 b/s/Hz x 1440 km) using the optical 16-QAM format.
Keywords :
III-V semiconductors; digital-analogue conversion; heterojunction bipolar transistors; indium compounds; optical communication; quadrature amplitude modulation; 16-QAM transmission experiment; InP; bit rate 100 Gbit/s; bit rate 171 Gbit/s; channel rates; frequency 25 GHz; heterojunction bipolar transistors technology; high-order multilevel optical transmission; high-speed DAC; high-speed digital-to-analog converters; optical QAM signals; optical QAM transmission technologies; quadrature amplitude modulation; spectral efficiency-distance product; word length 6 bit; High speed optical techniques; Optical filters; Optical modulation; Optical polarization; Optical transmitters; Quadrature amplitude modulation;
Conference_Titel :
Compound Semiconductor Integrated Circuit Symposium (CSICS), 2011 IEEE
Conference_Location :
Waikoloa, HI
Print_ISBN :
978-1-61284-711-5
Electronic_ISBN :
1550-8781
DOI :
10.1109/CSICS.2011.6062478
