Abstract
Optical phased arrays (OPAs), which manipulate an optical beam by controlling the phase of light, are optical devices characterized by high speed, small size, light weight, and high reliability that make various applications possible. In this study, an eight-channel-waveguide OPA using an electro-optic (EO) polymer for phase control was fabricated. Very high-speed optical beam scanning with a frequency of 2 MHz was demonstrated by applying a driving waveform superimposing sinusoidal and rectangular-wave voltages. Furthermore, the EO polymer OPA can be operated with a low total-operation power consumption of 0.38 mW at a scanning speed of 500 kHz.
Highlights
Optical phased arrays (OPAs) enable us to control an individual phase of the divided optical beam to manipulate an interference pattern of a combined optical beam [1]
Optical phased arrays (OPAs), which manipulate an optical beam by controlling the phase of light, are optical devices characterized by high speed, small size, light weight, and high reliability that make various applications possible
We previously demonstrated the basic operation of optical beam scanning via voltage control for OPAs with an EO polymer optical waveguide core for the first time [29]
Summary
Optical phased arrays (OPAs) enable us to control an individual phase of the divided optical beam to manipulate an interference pattern of a combined optical beam [1]. The phase control at the modulation frequency of over 1 MHz for OPAs utilizing the EO effect of InP has been suggested [19], [20]; the operation of the phase shifter was only confirmed in those literatures. It has been reported that the modulation band of a phase shifter of Si p-i-n phase modulators [21] and GaAs/AlGaAs quantum well phase modulators [22] are 200 MHz and 1 GHz, respectively; the power consumption was high due to the carrier injection, and the high-speed beam scanning was not confirmed in those literatures. We previously demonstrated the basic operation of optical beam scanning via voltage control for OPAs with an EO polymer optical waveguide core for the first time [29]. The remarkable performance of the EO-polymer OPA with respect to high-speed optical beam scanning and low-power opration was observed
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