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50-GHz Repetition Gain Switching Using a Cavity-Enhanced DFB Laser Assisted by Optical Injection Locking
UCL, Dept Elect & Elect Engn, London WC1E 7JE, England..ORCID iD: 0000-0002-9681-7933
II VI Inc, Fremont, CA 94538 USA..
KTH, School of Engineering Sciences (SCI), Applied Physics, Photonics.ORCID iD: 0000-0003-3056-4678
II VI Inc, Fremont, CA 94538 USA..
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2020 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 38, no 7, p. 1844-1850Article in journal (Refereed) Published
Abstract [en]

We demonstrate pulse generation at a repetition rate of 50 GHz by gain switching an injection-locked distributed feedback (DFB) laser. The small-signal BW of the DFB laser was enhanced from an intrinsic BW of 30 GHz to 52 GHz due to the joint effects of photon-photon resonance (PPR) and detuned loading. The detuned loading effect is achieved by exploiting the frequency-dependent cavity loss, which results in an increase of the effective differential gain, and correspondingly, the relaxation oscillation frequency. In addition to small-signal measurements, we show that the PPR and the detuned loading effects can also be utilized to improve large signal gain-switching, despite the dynamic changes of the detuned loading condition due to the large signal chirp. By modulating the laser with 50-GHz RF signals, we obtained 50-GHz repetition rate pulses from the gain-switched laser, confirming that the BW enhancement effects are still valid for large-signal modulation. Subsequently, we optically injection lock the gain-switched laser with strong external seeding light, which suppresses the chirp and creates coherent frequency tones with 50 GHz spacing. The optical injection locking (OIL) further enhances the large-signal BW, resulting in narrower pulse width of 9.5 ps (6.2 ps after deconvolution) in the time domain and three sideband peaks above 70% from the peak in the frequency domain (full width half maximum of 130 GHz). Assuming linear chirp, the pulse could be further compressed to 2.4 ps.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2020. Vol. 38, no 7, p. 1844-1850
Keywords [en]
Directly modulated lasers, gain switching, optical injection locking, photon-photon resonance
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-273511DOI: 10.1109/JLT.2020.2973198ISI: 000528516300028Scopus ID: 2-s2.0-85083287480OAI: oai:DiVA.org:kth-273511DiVA, id: diva2:1431182
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QC 20200519

Available from: 2020-05-19 Created: 2020-05-19 Last updated: 2020-05-19Bibliographically approved

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Schatz, Richard

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