Integrated germanium-on-silicon Franz-Keldysh vector modulator used with a Kramers-Kronig receiver.

Author(s) Tong, Y.; Zhang, Q.; Wu, X.; Chow, C.W.; Shu, C.; Tsang, H.Ki
Journal Opt Lett
Date Published 2018 Sep 15

We propose an integrated vector modulator based on two compact and high-speed germanium-on-silicon Franz-Keldysh electro-absorption modulators. The proposed vector modulator is extremely compact with a total footprint of only 1800  μm×200  μm. We further experimentally demonstrate a 4-quadrature-amplitude-modulation (4-QAM) at 40 Gb/s over a 20-km standard single-mode fiber transmission. The complex signal is successfully re-constructed with a single-ended photodiode in a recently proposed Kramers-Kronig receiver for future low-cost, low-power, and low-footprint datacenter interconnect applications. The preliminary performance of the vector modulator with a 16-QAM is also investigated.

DOI 10.1364/OL.43.004333
ISSN 1539-4794
Citation Opt Lett. 2018;43(18):43334336.