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Journal Article
Graphene electro-optic modulator with 30 GHz bandwidth
2015
Overview
Scientists have realized a graphene electro-optic modulator operating with a 30 GHz bandwidth and with a state-of-the-art modulation efficiency of 1.5 dB V
−1
, paving the way for fast digital communications.
Graphene has generated exceptional interest as an optoelectronic material
1
,
2
because its high carrier mobility
3
,
4
and broadband absorption
5
promise to make extremely fast and broadband electro-optic devices possible
6
,
7
,
8
,
9
. Electro-optic graphene modulators previously reported, however, have been limited in bandwidth to a few gigahertz
10
,
11
,
12
,
13
,
14
,
15
because of the large capacitance required to achieve reasonable voltage swings. Here, we demonstrate a graphene electro-optic modulator based on resonator loss modulation at critical coupling
16
that shows drastically increased speed and efficiency. Our device operates with a 30 GHz bandwidth and with a state-of-the-art modulation efficiency of 15 dB per 10 V. We also show the first high-speed large-signal operation in a graphene modulator, paving the way for fast digital communications using this platform. The modulator uniquely uses silicon nitride waveguides, an otherwise completely passive material platform, with promising applications for ultra-low-loss broadband structures and nonlinear optics.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
