Low Power All-Digital Radio-Over-Fiber Transmission for 28-GHz Band Using Parallel Electro-Absorption Modulators

Abstract

We present a low-power all-digital radio-over-fiber transmitter for beyond 28-GHz using sigma-delta modulation, a 140mW NRZ driver and parallel electro-absorption modulators. 5.25Gb/s (2.625Gb/s) 64-QAM is transported over 10-km SSMF at 1560nm with 7.6% (5.2%) EVM.

60 GHz Analog Radio-Over-Fiber Single Sideband Transmitter Chipset With 55nm SiGe BiCMOS Driver RFIC and Silicon Photonics Modulator PIC

“…The output of the mixer was coupled to the chip using GSG probes. The modulated optical signal from the chip was amplified using and erbium doped fiber amplifier (EDFA, Keopsys CEFA-C-HG) and 25 dB [10] 28 GHz GaAs + silicon 5.5 mm 2 REAM 124 mW 5.2 dBm 25 dB [11] 28 GHz All silicon 2.1 mm 2 OSSB SDM 140 mW 2 V 20 dB…”

“…Previously published integrated mmWave RoF chips have been demonstrated up to 30 GHz [9][10] [11]. The 30 GHz OSSB modulator in [9] integrated a quadrature hybrid on the PIC, which required a driver with a higher single channel output linearity while the hybrid is made with lumped inductors.…”

“…[10] demonstrated a 28 GHz GaAs driver while the PIC did not support OSSB. The PIC in [11] supports OSSB but the driver requires external in-phase and quadrature generation off the chipset. This paper furthers the state-of-the-art by demonstrating an all-silicon 60 GHz OSSB narrowband photonic transmitter (NBPhoTx) consisting of a SiGe BiCMOS RFIC and a silicon photonics PIC.…”