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A Beyond-1-Tb/s Coherent Optical Transmitter Front-End Based on 110-GHz-Bandwidth 2:1 Analog Multiplexer in 250-nm InP DHBT

2020; Institute of Electrical and Electronics Engineers; Volume: 55; Issue: 9 Linguagem: Inglês

10.1109/jssc.2020.2989579

1558-173X

Munehiko Nagatani, Hitoshi Wakita, Hiroshi Yamazaki, Yoshihiro Ogiso, Miwa Mutoh, M. Ida, Fukutaro Hamaoka, Masanori Nakamura, Takayuki Kobayashi, Yutaka Miyamoto, Hideyuki Nosaka,

Advanced Photonic Communication Systems

This article presents an optical transmitter front-end based on 2:1 analog multiplexer (AMUX) for beyond-1-Tb/s/carrier coherent optical communications systems. An AMUX is monolithically integrated with an optical modulator driver to realize an AMUX-Driver IC that can directly drive an optical modulator. The AMUX-Driver IC fabricated by using our in-house 250-nm InP double heterojunction bipolar transistors (DiBTs), which have a peak cutoff frequency (f T ) and maximum oscillation frequency (f max ) of 460 and 480 Giz, respectively, achieves a record bandwidth of 110 Giz and a 1.5-νppd linear differential output range with a <; 3% total harmonic distortion (TiD). A coherent optical transmitter front-end module compactly integrating two AMUX-Driver ICs and an InP-based optical in-phase quadrature (IQ) modulator achieves an electro-optic (EO) bandwidth higher than 80 Giz at the 6-dB point. Beyond-1-Tb/s/carrier optical modulation based on 168-GBaud polarization-division-multiplexed (PDM) 16-ary quadrature-amplitude-modulation (16QAM) was successfully demonstrated by using this integrated module.