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50-GHz Repetition G...
50-GHz Repetition Gain Switching Using a Cavity-Enhanced DFB Laser Assisted by Optical Injection Locking
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- Liu, Zhixin (författare)
- UCL, Dept Elect & Elect Engn, London WC1E 7JE, England.
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- Matsui, Yasuhiro (författare)
- II VI Inc, Fremont, CA 94538 USA.
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- Schatz, Richard, 1963- (författare)
- KTH,Fotonik
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- Khan, Ferdous (författare)
- II VI Inc, Fremont, CA 94538 USA.
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- Kwakernaak, Martin (författare)
- II VI Inc, Fremont, CA 94538 USA.
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- Sudo, Tsurugi (författare)
- II VI Inc, Fremont, CA 94538 USA.
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UCL, Dept Elect & Elect Engn, London WC1E 7JE, England II VI Inc, Fremont, CA 94538 USA. (creator_code:org_t)
- Institute of Electrical and Electronics Engineers (IEEE), 2020
- 2020
- Engelska.
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Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 38:7, s. 1844-1850
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Directly modulated lasers
- gain switching
- optical injection locking
- photon-photon resonance
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- ref (ämneskategori)
- art (ämneskategori)
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