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

Yeyu Tong, Qiulin Zhang, Xinru Wu, Chi-Wai Chow, Chester Shu, Hon Ki Tsang*

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

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 reconstructed 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.

Original languageEnglish
Pages (from-to)4333-4336
Number of pages4
JournalOptics Letters
Volume43
Issue number18
DOIs
StatePublished - 15 Sep 2018

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