Dual-cavity feedback assisted DFB narrow linewidth laser

Huang, Shihua; Zhu, Tao; Yin, Guolu; Lan, Tianyi; Li, Fuhui; Huang, Ligang; Liu, Min

doi:10.1038/s41598-017-01351-w

Cited by 24 publications

(10 citation statements)

References 25 publications

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“…The regulating linewidth suggests that injection power is in the third regime of the feedback effects [6]. Considering strong injection power would lead to the mode-hopping in the main cavity [9], the measured injection power was limited to 1.4 μW. The SMSR of the DFB under the maximum injection power was confirmed to be 71 dB by DSHI (20 km delay fiber), as shown in Fig.…”

Section: Resultsmentioning

confidence: 85%

Sinlge-frequency fiber laser with tunable linewidth by optical self-injection

Zheng

Luo

Chen

et al. 2022

Advanced Lasers, High-Power Lasers, and Applications XIII

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We experimentally demonstrated a fiber laser with tunable linewidth based on self-injection locking (SIL) and the stimulated Brillouin scattering (SBS) effect. The linewidth-tuning operation is achieved by limiting injection power within the third regime of the feedback effect. SBS can realize single longitudinal mode (SLM) by the ultra-narrow gain range, and generate ultra-narrow laser linewidth because of the high Q value. Additionally, we use Brillouin erbium fiber laser (BEFL) to replace the ordinary Brillouin ring cavity to obtain better SLM property. The lasing with ultra-narrow linewidth is steadily emitted after eliminating the mod-hopping caused by SIL and confirming the stable occurrence of SBS. In addition, The Lorentzian linewidth of DFB (1.7 kHz) and SIL with different injection power are measured by the delayed self-heterodyne interferometry (50 km delay fiber). The Lorentzian linewidth of the BEFL (60 Hz) is accurately measured by the Voigt fitting.

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Section: Resultsmentioning

confidence: 85%

Sinlge-frequency fiber laser with tunable linewidth by optical self-injection

Zheng

Luo

Chen

et al. 2022

Advanced Lasers, High-Power Lasers, and Applications XIII

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“…1, happens to be the front mirror r2 of the LD. After this, the light signal I2 is divided into two signals, namely I3, which is the reflected, and I4, which becomes the transmitted light signal due to the reflection of FBG [36,37] arising from the impact of L  happens to be similar to that reported in [38]. However, the structures are different since our laser system consists of two FBGs and shorter fiber lengths.…”

Section: Principle and Simulationmentioning

confidence: 89%

1310 nm Narrow Linewidth Laser Assisted by the Feedback of Double-FBGs

et al. 2020

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Narrow linewidth lasers with kHz or Hz have attracted tremendous attention due to their versatile applications in optical fiber sensing and optical fiber communication fields. This is because the efficiency of these fields depends on the quality of the laser source employed. This paper proposes, simulates, and experimentally demonstrates a dual cavity fiber Bragg grating assisted feedback structure. Based on the Rayleigh backscattering mechanism, Vernier effect, and interference phenomenon, the 2 MHz linewidth of a 1310 nm distributed feedback laser was highly compressed to ~580 Hz with a side mode suppression ratio as high as 34 dB. The output power of our proposed laser was found to be stable at 2.0 mW. The outcome of this work presents an idea centered on laser linewidth compression that applies to DFB lasers operating at various wavelengths.

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“…Moreover, extensive research is today being performed on hardware and software solutions targeting power/cost reduction of coherent technology in the mid-to-long-term. Studies on self-coherent systems [28], [29], DSP-free configurations [23], low-power DSP [30], optical signal processing [23], [28], narrow-linewidth semiconductor low-cost lasers [31] and integration [32] are achieving ground-breaking results that will likely pave the way to the introduction of coherent in short reach communications. Some specific techno-economic studies tailored for 400G have shown that a single-wavelength coherent solution has very similar power consumption and ASIC footprint of a 4 lanes 100G DD solution [33].…”

Section: Discussionmentioning

confidence: 99%

Scaling Laws for Unamplified Coherent Transmission in Next-generation Short-Reach and Access Networks

Rizzelli¹,

Nespola²,

Straullu³

et al. 2021

Preprint

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International standardization bodies (IEEE and ITU-T) working on the evolution of transmission technologies are still considering traditional direct detection solutions for the most relevant short reach optical link applications, that are Passive Optical Networks (PON) and intra-data center interconnects. Anyway, future jumps towards even higher bit rates per wavelength will require a complete paradigm shift, moving towards coherent technologies. In this paper, we thus study both analytically and experimentally the scaling laws of unamplified coherent transmission in the short-reach communications ecosystems. We believe that, given the extremely tight technoeconomic constraints, such a revolutionary transition towards coherent in short-reach first requires a very detailed study of its intrinsic capabilities in largely extending the limitation currently imposed by direct detection systems. To this end, this paper focuses on the ultimate physical layer limitations of unamplified coherent systems in terms of bit rate and power budget. The main parameters of our performance estimation model are extracted through fitting with a set of experimental characterizations and later used as the starting point of a scaling laws study regarding local oscillator power, modulator-induced attenuation, bit rate, and maximum achievable power budget. The analytically predicted performance is then verified through transmission experiments, including a demonstration on a 37-km installed metropolitan dark fiber in the city of Turin. Our findings show that coherent detection without optical pre-amplification and using PM-QPSK can tolerate optical power budget (OPB) well above, for instance, the 29 dB imposed by the current PON standards even at extremely high raw bit rates up to 800 Gbps. PM-16QAM, on the other hand, can provide up to 190 Gbps at 29 dB OPB only if combined with soft FEC algorithms. Even higher bit rate are also shown for the less demanding power budget needed in intra-data centers links.

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Dual-cavity feedback assisted DFB narrow linewidth laser

Cited by 24 publications

References 25 publications

Sinlge-frequency fiber laser with tunable linewidth by optical self-injection

Sinlge-frequency fiber laser with tunable linewidth by optical self-injection

1310 nm Narrow Linewidth Laser Assisted by the Feedback of Double-FBGs

Scaling Laws for Unamplified Coherent Transmission in Next-generation Short-Reach and Access Networks

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