Abstract
A simple optical circuit made by a cascade of two graphene-on-silicon electro absorption modulators (EAMs) of different length is used for the optical pre-emphasis of 10 Gb/s non-return-to-zero (NRZ) signals by delay-inverse-weight compensation. Transmission up to 100 km on single mode fiber (SMF) without dispersion compensation is reported, showing also the large performance advantage (6 dB in back-to back and around 5 dB in transmission) in respect of the conventional single EAM transmitter configuration.
Highlights
G RAPHENE is nowadays extensively studied for a large range of applications including its use in photonic integrated circuits (PICs) [1]
We show that signals generated by graphene electro absorption modulators (EAMs) can be significantly improved by optical pre-emphasis using a simple compact circuit made cascading two short graphene EAMs driven by two proper complementary electrical signals
An optical continuous wave (CW) signal generated by an external cavity laser (ECL) at 1550 nm was coupled into the chip through a transverse electric (TE) vertical grating coupler
Summary
G RAPHENE is nowadays extensively studied for a large range of applications including its use in photonic integrated circuits (PICs) [1]. Graphene electro absorption modulators (EAMs), in particular, have been reported working at 10 Gb/s [7], and very recently, at 20 Gb/s [8], using a single layer configuration, being mainly bandwidth limited by the graphene-metal electrical contact resistance value.
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