Abstract
As bit rates of optical interconnects increase, a large amount of complicated signal conditioning is needed to compensate for the insufficient bandwidth of current modulators. In this paper, we evaluate the reduced equalization requirements of high-bandwidth plasmonic modulators in short-reach transmission experiments. It is shown that transmission of 100 Gbit/s non-return-to-zero (NRZ) and 112 Gbit/s pulse-amplitude modulation-4 over 1 km and 2 km distance is possible without any receiver equalization. At higher bit-rates, such as 120 Gbit/s NRZ, data transmission is demonstrated over 500 m with reduced receiver equalization requirements. Transmission up to 200 Gbit/s over 1 km is also shown with more complex receiver equalization. The reduced complexity of the receiver digital signal processing is attributed to a flat frequency response of at least 108 GHz of the plasmonic modulators. All single wavelength transmissions have been performed at 1540 nm in standard single mode fiber.
Highlights
High-speed electro-optic (EO) modulators are an essential component in today’s communication network that connects electrical information processing with the optical information transport
This is a prerequisite to mitigate the capacity bottleneck between electrical and optical interfaces and to remedy their disparity [1]. Such EO modulators are required for transceivers with intensity-modulation and direction-detection (IM/direct detection (DD)) in shortreach optical interconnects where transmission distance of 100 m and up to 2 km are bridged and low complexity is of significant importance
We analyzed the electro-optic-electrical (EOE) frequency response derived by digital signal processing (DSP) from a 120 Gbit/s NRZ signal in an electrical and optical back-to-back (BTB) measurement
Summary
High-speed electro-optic (EO) modulators are an essential component in today’s communication network that connects electrical information processing with the optical information transport. A large EO modulation bandwidth in combination with a small footprint, low driving voltages and a simple and cost-efficient receiver design are the key design parameters for EO modulators to enable the generation of optical communication systems. This is a prerequisite to mitigate the capacity bottleneck between electrical and optical interfaces and to remedy their disparity [1]. To optimize the cost efficiency of such transceivers, the number of parallel lanes should be kept minimal to decrease the amount of optical components. Driving voltages of such modulators should be kept below one volt to avoid power hungry driver amplifier electronics and to enable most compact integration [4]
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