2017
DOI: 10.1038/s41467-017-00958-x
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Statistical parity-time-symmetric lasing in an optical fibre network

Abstract: Parity-time (PT)-symmetry in optics is a condition whereby the real and imaginary parts of the refractive index across a photonic structure are deliberately balanced. This balance can lead to interesting optical phenomena, such as unidirectional invisibility, loss-induced lasing, single-mode lasing from multimode resonators, and non-reciprocal effects in conjunction with nonlinearities. Because PT-symmetry has been thought of as fragile, experimental realisations to date have been usually restricted to on-chip… Show more

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Cited by 32 publications
(16 citation statements)
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“…We note that an increase of lasing power P 1 along with optical losses jg 2 j appears as a result of energy redistribution between cavities, rather than the total energy growth. A conceptually similar power dependence has been reported recently in a PT laser of another type [19].…”
Section: Methods and Resultssupporting
confidence: 85%
See 1 more Smart Citation
“…We note that an increase of lasing power P 1 along with optical losses jg 2 j appears as a result of energy redistribution between cavities, rather than the total energy growth. A conceptually similar power dependence has been reported recently in a PT laser of another type [19].…”
Section: Methods and Resultssupporting
confidence: 85%
“…Furthermore, a realization of PT-symmetry-based mode locking [16] and a PT-symmetric laser absorber [17] were theoretically proposed, and lasing and anti-lasing in a single cavity were demonstrated [18]. Recently, a statistical PT-symmetric lasing has been achieved in an optical fiber network incorporating semiconductor amplifiers [19].…”
Section: Introductionmentioning
confidence: 99%
“…Here, we experimentally prove that, by placing a shunt lossy element in the transmitting node before the obstacle and a judiciously designed gain element in the receiving node, forming a PT-symmetric conjugate pair [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], we can restore full transmission at the operational frequency, despite the presence of a nearly unitary reflective obstacle blocking the transmission channel. The obstacle in our experiment is modeled as a shorting element along a transmission line.…”
Section: Introductionmentioning
confidence: 99%
“…This scheme has been lately demonstrated in microring lasers (involving whispering gallery modes) without any compromise in terms of slope efficiency or threshold pump intensities (see Figure 1B, C) [54][55][56][57]. PT-symmetric lasers have also been demonstrated in various other platforms such as electrically pumped integrated arrangements [58,59] and optical fibers [60]. A similar approach can be applied to achieve single-frequency lasing through the use of EPs, an aspect demonstrated in dark-state lasers [61,62].…”
Section: Lasers and Non-hermitian Symmetry Breakingmentioning
confidence: 98%