75 GBd InP‐HBT MUX‐DAC module for high‐symbol‐rate optical transmission. Issue 9 (1st April 2015)

• Record Type: Journal Article
• Authors: Nagatani, M.; Wakita, H.; Nosaka, H.; Kurishima, K.; Ida, M.; Sano, A.; Miyamoto, Y.
• Is Part Of: Electronics letters. Volume 51:Issue 9(2015)
• Page Start: 710
• Page End: 712
• Publication Date: 2015-04-01
• Subjects: indium compounds -- heterojunction bipolar transistors -- bipolar transistor circuits -- multiplexing equipment -- III‐V semiconductors -- optical communication -- digital‐analogue conversion -- pulse amplitude modulation -- optical modulation; high‐symbol‐rate optical transmission -- HBT MUX‐DAC module -- ultra‐broadband digital‐to‐analogue converter -- half‐rate clock -- connectors -- broadband characteristics -- four‐level pulse amplitude modulation signals -- PAM4 signals -- eye openings -- high‐symbol‐rate optical transmitters -- word length 6 bit -- size 1 mm -- InP; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2015.0686
• Languages: English
• ISSNs: 0013-5194

Abstract

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.