Abstract
An integrated electro-optic modulator based on a waveguide Bragg grating in thin-film lithium niobate is introduced. The compact device with a footprint of 10 × 400 μm2 displays an optical extinction ratio of 53.8 dB at a wavelength of 1555.9 nm in the C-band. With a simple intensity modulation and direct detection scheme, data rates up to 100 Gbit/s are demonstrated with 2-, 4- and 8-level pulse-amplitude modulation formats. The optical filter characteristic of a waveguide Bragg grating modulator suppresses one optical sideband, resulting in inherent single sideband modulation. This enables transmission of a 100 Gbit/s on-off keying signal over 12 km of standard single-mode fiber at 1559.05 nm, without the need for chromatic dispersion compensation.
Highlights
H IGH-BANDWIDTH electro-optic modulators (EOMs) are key components in optical communication systems [1] and microwave photonics [2], [3]
We propose an integrated EOM on lithium niobate on insulator (LNOI) based on a waveguide Bragg grating (WBG) structure for intensity modulation (IM) systems with direct detection (DD)
Light from a tunable laser source (TLS) in the C-band is optionally pre-amplified by an erbium doped fiber amplifier (EDFA) to 17.9 dBm before being coupled to the chip
Summary
H IGH-BANDWIDTH electro-optic modulators (EOMs) are key components in optical communication systems [1] and microwave photonics [2], [3]. EOMs based on WBGs have small footprints in the order of 10 × 400 μm and offer the possibility for high level parallelization on a single chip while the electro-optic bandwidth is not cavity-photon lifetime limited. We demonstrate transmission of a 100 Gbit/s NRZ-OOK signal in a IM/DD system over a SMF of 12 km without any dispersion correction, enabled by the SSB modulation inherent to a WBG modulator
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