Sadiq, Muhammad Usman, Zhang, Hongyu, O'Callaghan, James, Roycroft, Brendan, Kavanagh, Niamh, Thomas, Kevin, Gocalinska, Agnieszka, Chen, Yong, Bradley, Thomas, Hayes, John, Li, Zhihong, Alam, Shaif-ul, Poletti, Francesco, Petrovich, Marco, Richardson, David, Pelucchi, Emanuele, O'Brien, Peter, Peters, Frank H., Garcia Gunning, Fatima C. and Corbett, Brian (2016) 40Gb/s WDM transmission over 1.15km HC-PBGF using an InP-based Mach-Zehnder modulator at 2µm. Journal of Lightwave Technology, 34 (8), 1706-1711. (doi:10.1109/JLT.2015.2508941).
Abstract
The 2µm wavelength range has emerged as a low-loss and low-latency optical transmission window when using hollow-core photonic band gap fiber (HC-PBGF) and high-gain thulium-doped fiber amplifiers (TDFA). Various single and multichannel transmission experiments at these wavelengths have been implemented using directly modulated lasers and LiNbO3-based modulators. Here, we report the transmission performance of an externally modulated 4 x 10Gb/s NRZ-OOK WDM signal over 1.15km of low-loss HC-PBGF employing an InP-based Mach-Zehnder modulator (MZM) in the transmitter for the first time. An OSNR of 25dB on 100GHz spaced channels is required using a direct detection scheme. Furthermore, we demonstrate the lowest V(pi) InP-based MZM operating at 2µm by increasing the electro-optical overlap in the optical waveguide. The peak-peak modulation voltage is reduced significantly from 4 to 2.7V with an electro-optic bandwidth of 9GHz.
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