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Photonics
Volume 7
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10.3390/photonics7010020
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Article

Side-lobe Level Reduction of an Optical Phased Array Using Amplitude and Phase Modulation of Array Elements Based on Optically Injection-Locked Semiconductor Lasers

by
Anh Hang Nguyen
,
Jun-Hyung Cho
,
Ho-Jun Bae
and
Hyuk-Kee Sung
*
School of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Korea
*
Author to whom correspondence should be addressed.
Photonics 2020, 7(1), 20; https://doi.org/10.3390/photonics7010020
Submission received: 21 January 2020 / Revised: 19 February 2020 / Accepted: 22 February 2020 / Published: 24 February 2020
(This article belongs to the Section Lasers, Light Sources and Sensors)
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Abstract

The side-lobe level (SLL) in optical phased array (OPA) systems should be reduced to ensure their high performance. We investigate theoretically the performance of an OPA based on optically injection-locked (OIL) semiconductor lasers. The phase and amplitude of the OIL laser are modulated by controlling the injection-locking parameters to reduce the SLL as well as to achieve beam steering. We successfully achieved an SLL reduction of >16 dB when compared with the uniform amplitude profile based on the application of the Taylor window function profile to the injection-locked OPA elements. The reduced SLL and high power efficiency achieved in this study can expedite the use of OPA in real field applications, such as free-space communication, imaging, and light detection and ranging (LIDAR).
Keywords: optical injection locking; optical phased array; optical modulation; side-lobe level reduction optical injection locking; optical phased array; optical modulation; side-lobe level reduction

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MDPI and ACS Style

Nguyen, A.H.; Cho, J.-H.; Bae, H.-J.; Sung, H.-K. Side-lobe Level Reduction of an Optical Phased Array Using Amplitude and Phase Modulation of Array Elements Based on Optically Injection-Locked Semiconductor Lasers. Photonics 2020, 7, 20. https://doi.org/10.3390/photonics7010020

AMA Style

Nguyen AH, Cho J-H, Bae H-J, Sung H-K. Side-lobe Level Reduction of an Optical Phased Array Using Amplitude and Phase Modulation of Array Elements Based on Optically Injection-Locked Semiconductor Lasers. Photonics. 2020; 7(1):20. https://doi.org/10.3390/photonics7010020

Chicago/Turabian Style

Nguyen, Anh Hang, Jun-Hyung Cho, Ho-Jun Bae, and Hyuk-Kee Sung. 2020. "Side-lobe Level Reduction of an Optical Phased Array Using Amplitude and Phase Modulation of Array Elements Based on Optically Injection-Locked Semiconductor Lasers" Photonics 7, no. 1: 20. https://doi.org/10.3390/photonics7010020

APA Style

Nguyen, A. H., Cho, J.-H., Bae, H.-J., & Sung, H.-K. (2020). Side-lobe Level Reduction of an Optical Phased Array Using Amplitude and Phase Modulation of Array Elements Based on Optically Injection-Locked Semiconductor Lasers. Photonics, 7(1), 20. https://doi.org/10.3390/photonics7010020

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