scholarly journals Propagation of temporal mode multiplexed optical fields in fibers: influence of dispersion

2021 ◽  
Author(s):  
Wen Zhao ◽  
Nan Huo ◽  
Liang Cui ◽  
Xiaoying Li ◽  
Zhe-Yu Ou
Keyword(s):  
2021 ◽  
Author(s):  
Wen Zhao ◽  
Nan Huo ◽  
Liang Cui ◽  
Zheyu Ou ◽  
Xiaoying Li
Keyword(s):  

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Nakao Hayashi ◽  
Chunhua Li ◽  
Pavel I. Naumkin

We consider the initial value problem for the nonlinear dissipative Schrödinger equations with a gauge invariant nonlinearityλup-1uof orderpn<p≤1+2/nfor arbitrarily large initial data, where the lower boundpnis a positive root ofn+2p2-6p-n=0forn≥2andp1=1+2forn=1.Our purpose is to extend the previous results for higher space dimensions concerningL2-time decay and to improve the lower bound ofpunder the same dissipative condition onλ∈C:Im⁡ λ<0andIm⁡ λ>p-1/2pRe λas in the previous works.


Author(s):  
Hai Bi ◽  
Chao Jing ◽  
Peter Hasch ◽  
Yuxiang Gong ◽  
Daniel Gerster ◽  
...  

Nanophotonics ◽  
2020 ◽  
Vol 9 (11) ◽  
pp. 3535-3544 ◽  
Author(s):  
Laura Mercadé ◽  
Leopoldo L. Martín ◽  
Amadeu Griol ◽  
Daniel Navarro-Urrios ◽  
Alejandro Martínez

AbstractCavity optomechanics has recently emerged as a new paradigm enabling the manipulation of mechanical motion via optical fields tightly confined in deformable cavities. When driving an optomechanical (OM) crystal cavity with a laser blue-detuned with respect to the optical resonance, the mechanical motion is amplified, ultimately resulting in phonon lasing at MHz and even GHz frequencies. In this work, we show that a silicon OM crystal cavity performs as an OM microwave oscillator when pumped above the threshold for self-sustained OM oscillations. To this end, we use an OM cavity designed to have a breathing-like mechanical mode at 3.897 GHz in a full phononic bandgap. Our measurements show that the first harmonic of the detected signal displays a phase noise of ≈−100 dBc/Hz at 100 kHz. Stronger blue-detuned driving leads eventually to the formation of an OM frequency comb, whose lines are spaced by the mechanical frequency. We also measure the phase noise for higher-order harmonics and show that, unlike in Brillouin oscillators, the noise is increased as corresponding to classical harmonic mixing. Finally, we present real-time measurements of the comb waveform and show that it can be fitted to a theoretical model recently presented. Our results suggest that silicon OM cavities could be relevant processing elements in microwave photonics and optical RF processing, in particular in disciplines requiring low weight, compactness and fiber interconnection.


Sensors ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 251
Author(s):  
Mandeep Kaur ◽  
Pierre M. Lane ◽  
Carlo Menon

Endoscopes are used routinely in modern medicine for in-vivo imaging of luminal organs. Technical advances in the micro-electro-mechanical system (MEMS) and optical fields have enabled the further miniaturization of endoscopes, resulting in the ability to image previously inaccessible small-caliber luminal organs, enabling the early detection of lesions and other abnormalities in these tissues. The development of scanning fiber endoscopes supports the fabrication of small cantilever-based imaging devices without compromising the image resolution. The size of an endoscope is highly dependent on the actuation and scanning method used to illuminate the target image area. Different actuation methods used in the design of small-sized cantilever-based endoscopes are reviewed in this paper along with their working principles, advantages and disadvantages, generated scanning patterns, and applications.


2021 ◽  
Author(s):  
Mina R. Bionta ◽  
Felix Ritzkowsky ◽  
Marco Turchetti ◽  
Yujia Yang ◽  
Dario Cattozzo Mor ◽  
...  
Keyword(s):  

2013 ◽  
Vol 7 (1) ◽  
pp. 1-31
Author(s):  
James Adam Redfield

Abstract This paper proposes a new phenomenological approach to social history by clarifying, critiquing and developing key insights from Husserl’s late work. First, it clarifies how Husserl began to refute phenomenology’s so-called solipsism and ahistoricality by advancing a concept of history that integrates subjective, intersubjective and communal organizations of experience. This concept, his “history of presence”, can be called a “temporal mode of oriented constitution”. Its value is to show how a single recursive series of determinations organizes a diverse set of epistemic norms, personal memories, and intersubjective apperceptions. As we analyze each moment of this series, the history of presence emerges as highly relevant to social inquiry, inasmuch as it highlights the roles of intersubjective awareness and shared “world-time”. Second, however, the paper shows that Husserl grounded his history, not in this self-other-world triad, but in metaphysical foundations. By falling back on an atemporal principle of identity, Husserl’s thirst for Cartesian certainty obscured some of his insights. To develop these, the paper concludes with a new look at Les maîtres fous, a famous and controversial ethnographic film by Jean Rouch. Much of Rouch’s film echoes Husserl’s own problems, but Rouch’s use of montage replaces metaphysics with rhythm, identity with alterity, hegemony with mimicry, harmonious perception with dissonant yet generative apperception. Thus, Rouch dramatizes Husserl’s relevance to the phenomenology of social history. This paper’s internal critique and cross-cultural juxtaposition of Husserl’s late work portrays such relevance more accurately than Derrida’s uncharitable “metaphysics of presence” critique.


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