Determining the Stable Injection Locking of a Fabry-Pérot Laser by Observing the RF Spectral Components Generated by a Low-Reflectivity External Cavity

A novel approach to monitoring the laser injection-locking (IL) state is proposed and verified using the side-mode suppression ratio (SMSR). In a photonics experiment for laser IL, an optical spectrum analyzer with the conventional criterion of a 35-dB SMSR is conventionally used to detect the locki...

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Autores principales:	Jakup Ratkoceri, Bostjan Batagelj
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Fabry–Pérot laser diode injection locking mode-locked laser locking range linewidth self-homodyne Applied optics. Photonics TA1501-1820
Acceso en línea:	https://doaj.org/article/97eb4a3497a643bf9bdb4745c8d60181
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id	oai:doaj.org-article:97eb4a3497a643bf9bdb4745c8d60181
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spelling	oai:doaj.org-article:97eb4a3497a643bf9bdb4745c8d601812021-11-25T18:43:16ZDetermining the Stable Injection Locking of a Fabry-Pérot Laser by Observing the RF Spectral Components Generated by a Low-Reflectivity External Cavity10.3390/photonics81104872304-6732https://doaj.org/article/97eb4a3497a643bf9bdb4745c8d601812021-10-01T00:00:00Zhttps://www.mdpi.com/2304-6732/8/11/487https://doaj.org/toc/2304-6732A novel approach to monitoring the laser injection-locking (IL) state is proposed and verified using the side-mode suppression ratio (SMSR). In a photonics experiment for laser IL, an optical spectrum analyzer with the conventional criterion of a 35-dB SMSR is conventionally used to detect the locking state of a Fabry–Pérot (FP) laser with multiple longitudinal modes to an external master laser with one longitudinal mode. Since the 35-dB criterion is not always a sufficient locking condition, we propose a microwave-photonic technique to determine the stable-locking regime based on the observation of the radio-frequency (RF) components. A novel approach to monitoring the generated additional spectral components uses the well-known delayed-self-homodyne technique and the RF spectrum analyzer. For the novel generation of additional longitudinal groups on each FP laser’s resonator mode in the optical spectrum and consequently the overlapping RF components in the RF spectrum, an additional external resonator with low reflectivity was connected to the slave FP laser. The novel monitoring approach was experimentally verified by connecting a 1-m-long external cavity with 0.5% reflectivity and observing the optical IL phenomenon of a 1550-nm FP semiconductor laser.Jakup RatkoceriBostjan BatageljMDPI AGarticleFabry–Pérot laser diodeinjection lockingmode-locked laserlocking rangelinewidthself-homodyneApplied optics. PhotonicsTA1501-1820ENPhotonics, Vol 8, Iss 487, p 487 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Fabry–Pérot laser diode injection locking mode-locked laser locking range linewidth self-homodyne Applied optics. Photonics TA1501-1820
spellingShingle	Fabry–Pérot laser diode injection locking mode-locked laser locking range linewidth self-homodyne Applied optics. Photonics TA1501-1820 Jakup Ratkoceri Bostjan Batagelj Determining the Stable Injection Locking of a Fabry-Pérot Laser by Observing the RF Spectral Components Generated by a Low-Reflectivity External Cavity
description	A novel approach to monitoring the laser injection-locking (IL) state is proposed and verified using the side-mode suppression ratio (SMSR). In a photonics experiment for laser IL, an optical spectrum analyzer with the conventional criterion of a 35-dB SMSR is conventionally used to detect the locking state of a Fabry–Pérot (FP) laser with multiple longitudinal modes to an external master laser with one longitudinal mode. Since the 35-dB criterion is not always a sufficient locking condition, we propose a microwave-photonic technique to determine the stable-locking regime based on the observation of the radio-frequency (RF) components. A novel approach to monitoring the generated additional spectral components uses the well-known delayed-self-homodyne technique and the RF spectrum analyzer. For the novel generation of additional longitudinal groups on each FP laser’s resonator mode in the optical spectrum and consequently the overlapping RF components in the RF spectrum, an additional external resonator with low reflectivity was connected to the slave FP laser. The novel monitoring approach was experimentally verified by connecting a 1-m-long external cavity with 0.5% reflectivity and observing the optical IL phenomenon of a 1550-nm FP semiconductor laser.
format	article
author	Jakup Ratkoceri Bostjan Batagelj
author_facet	Jakup Ratkoceri Bostjan Batagelj
author_sort	Jakup Ratkoceri
title	Determining the Stable Injection Locking of a Fabry-Pérot Laser by Observing the RF Spectral Components Generated by a Low-Reflectivity External Cavity
title_short	Determining the Stable Injection Locking of a Fabry-Pérot Laser by Observing the RF Spectral Components Generated by a Low-Reflectivity External Cavity
title_full	Determining the Stable Injection Locking of a Fabry-Pérot Laser by Observing the RF Spectral Components Generated by a Low-Reflectivity External Cavity
title_fullStr	Determining the Stable Injection Locking of a Fabry-Pérot Laser by Observing the RF Spectral Components Generated by a Low-Reflectivity External Cavity
title_full_unstemmed	Determining the Stable Injection Locking of a Fabry-Pérot Laser by Observing the RF Spectral Components Generated by a Low-Reflectivity External Cavity
title_sort	determining the stable injection locking of a fabry-pérot laser by observing the rf spectral components generated by a low-reflectivity external cavity
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/97eb4a3497a643bf9bdb4745c8d60181
work_keys_str_mv	AT jakupratkoceri determiningthestableinjectionlockingofafabryperotlaserbyobservingtherfspectralcomponentsgeneratedbyalowreflectivityexternalcavity AT bostjanbatagelj determiningthestableinjectionlockingofafabryperotlaserbyobservingtherfspectralcomponentsgeneratedbyalowreflectivityexternalcavity
_version_	1718410788804231168

Determining the Stable Injection Locking of a Fabry-Pérot Laser by Observing the RF Spectral Components Generated by a Low-Reflectivity External Cavity

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