Title :
75 GBd InP-HBT MUX-DAC module for high-symbol-rate optical transmission
Author :
Nagatani, M. ; Wakita, H. ; Nosaka, H. ; Kurishima, K. ; Ida, M. ; Sano, A. ; Miyamoto, Y.
Author_Institution :
NTT Device Technol. Labs., NTT Corp., Atsugi, Japan
Abstract :
An ultra-broadband 6 bit digital-to-analogue converter (DAC) has been designed and fabricated in InP-HBT technology. The DAC IC includes six 2:1 MUXs and thus operates with a half-rate clock. The DAC module is equipped with 1 mm connectors for its analogue output to ensure broadband characteristics. The measured analogue output bandwidth (BW) is >40 GHz. Four-level pulse amplitude modulation signals with clear eye openings were measured at symbol rates of up to 75 GBd. This MUX-DAC module has the widest BW of any previously reported DACs and is suitable for high-symbol-rate optical transmitters.
Keywords :
III-V semiconductors; bipolar transistor circuits; digital-analogue conversion; heterojunction bipolar transistors; indium compounds; multiplexing equipment; optical communication; optical modulation; pulse amplitude modulation; HBT MUX-DAC module; InP; PAM4 signals; broadband characteristics; connectors; eye openings; four-level pulse amplitude modulation signals; half-rate clock; high-symbol-rate optical transmission; high-symbol-rate optical transmitters; size 1 mm; ultra-broadband digital-to-analogue converter; word length 6 bit;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2015.0686
