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access icon free Photonic integrated circuits for terahertz source generation

© The Institution of Engineering and Technology
Received 18/06/2019, Accepted 10/02/2020, Revised 08/01/2020, Published 12/02/2020

The authors introduce four kinds of terahertz photonics components based on photonic integrated circuits (PICs). A PIC-based integrated optoelectronic synthesiser for THz communications is described, which can be tuned continuously over the range 0.254–2.723 THz using photomixing. A laterally-coupled dual-grating distributed feedback laser (DFB) diode integrated with an electroabsorption modulator is used to generate an 820 GHz beat signal. THz signal production is reported using a dual-wavelength DFB diode laser with a two-section phase-shifted sampled Bragg grating. Finally, a THz source at 640 GHz, based on a sampled grating distributed Bragg reflector semiconductor mode-locked laser diode, is reported offering superior reproducibility, controllability, and a wider operation range than other reported mode-locked THz laser diodes. Each of these sources is a monolithic construction emitting light at 1.5 µm. The light can be amplified in an erbium-doped fibre amplifier, delivered over silica optical fibre and used to generate THz radiation via a photodiode antenna or photoconductive antenna in a remote location.

Inspec keywords: distributed feedback lasers; distributed Bragg reflector lasers; antennas; semiconductor optical amplifiers; photodiodes; terahertz wave generation; integrated optoelectronics; laser modes; Bragg gratings; semiconductor lasers; optical fibre amplifiers; silicon compounds; laser mode locking; laser tuning; optical fibres; electroabsorption; erbium; microwave photonics; electro-optical modulation

Other keywords: frequency 820.0 GHz; erbium-doped fibre amplifier; frequency 0.254 THz to 2.723 THz; photodiode antenna; photomixing; wavelength 1.5 mum; terahertz photonics components; frequency 640.0 GHz; THz source; dual-wavelength DFB diode laser; terahertz source generation; SiO2; sampled grating distributed Bragg reflector semiconductor mode-locked laser diode; photonic integrated circuits; two-section phase-shifted sampled Bragg grating; silica optical fibre; photoconductive antenna; THz communications; laterally-coupled dual-grating distributed feedback laser diode; beat signal; PIC-based integrated optoelectronic synthesiser; electroabsorption modulator; THz signal production

Subjects: Fibre lasers and amplifiers; Fibre lasers and amplifiers; Laser beam modulation, pulsing and switching; mode locking and tuning; Design of specific laser systems; Optical beam modulators; Electro-optical devices; Lasing action in semiconductors; Integrated optoelectronics; Semiconductor lasers; Other optical system components; Gratings, echelles; Photoelectric devices; Single antennas; Microwave photonics; Laser beam modulation, pulsing and switching; mode locking and tuning

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