optical isolators
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Photonics ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 43
Author(s):  
Mónica Far Brusatori ◽  
Nicolas Volet

To increase the spectral efficiency of coherent communication systems, lasers with ever-narrower linewidths are required as they enable higher-order modulation formats with lower bit-error rates. In particular, semiconductor lasers are a key component due to their compactness, low power consumption, and potential for mass production. In field-testing scenarios their output is coupled to a fiber, making them susceptible to external optical feedback (EOF). This has a detrimental effect on its stability, thus it is traditionally countered by employing, for example, optical isolators and angled output waveguides. In this work, EOF is explored in a novel way with the aim to reduce and stabilize the laser linewidth. EOF has been traditionally studied in the case where it is applied to only one side of the laser cavity. In contrast, this work gives a generalization to the case of feedback on both sides. It is implemented using photonic components available via generic foundry platforms, thus creating a path towards devices with high technology-readiness level. Numerical results shows an improvement in performance of the double-feedback case with respect to the single-feedback case. In particularly, by appropriately selecting the phase of the feedback from both sides, a broad stability regime is discovered. This work paves the way towards low-cost, integrated and stable narrow-linewidth integrated lasers.


Optica ◽  
2021 ◽  
Author(s):  
Rui Ma ◽  
Sander Reniers ◽  
Yuya Shoji ◽  
Tetsuya Mizumoto ◽  
Kevin Williams ◽  
...  

2021 ◽  
Author(s):  
Reo Oshikiri ◽  
Yuka Kobayashi ◽  
Satoshi Nishiyama ◽  
Hromasa Shimizu

2021 ◽  
Vol 9 (15) ◽  
pp. 2101068
Author(s):  
Viktar S. Asadchy ◽  
Cheng Guo ◽  
Bo Zhao ◽  
Shanhui Fan

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Yiqi Hu ◽  
Yihong Qi ◽  
Yu You ◽  
Shicheng Zhang ◽  
Gongwei Lin ◽  
...  

2021 ◽  
Author(s):  
Michael Coco ◽  
Sean McDaniel ◽  
Gary Cook

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Gil Bashan ◽  
Hilel Hagai Diamandi ◽  
Yosef London ◽  
Kavita Sharma ◽  
Keren Shemer ◽  
...  

AbstractOpto-mechanical interactions in guided wave media are drawing great interest in fundamental research and applications. Forward stimulated Brillouin scattering, in particular, is widely investigated in optical fibres and photonic integrated circuits. In this work, we report a comprehensive study of forward stimulated Brillouin scattering over standard, panda-type polarization maintaining fibres. We distinguish between intra-polarization scattering, in which two pump tones are co-polarized along one principal axis, and inter-polarization processes driven by orthogonally polarized pump waves. Both processes are quantified in analysis, calculations and experiment. Inter-modal scattering, in particular, introduces cross-polarization switching of probe waves that is non-reciprocal. Switching takes place in multiple wavelength windows. The results provide a first demonstration of opto-mechanical non-reciprocity of forward scatter in standard fibre. The inter-polarization process is applicable to distributed sensors of media outside the cladding and coating boundaries, where light cannot reach. The process may be scaled towards forward Brillouin lasers, optical isolators and circulators and narrowband microwave-photonic filters over longer sections of off-the-shelf polarization maintaining fibres.


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