Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Polarimetric parity-time-symmetric photonic system

The system consists of a single spatial loop, in which two equivalent polarimetric loops are formed by recirculating light waves of orthogonal polarization states in the loop. To achieve PT symmetry, the phase retardance, power ratio, and coupling coefficient between the orthogonally polarized light waves are tuned by controlling PC1 in the birefringent path, and the lasing threshold is tuned by controlling PC2 in the coupled path. PC: polarization controller; Pol.: polarizer; EDFA: erbium-doped fiber amplifier; OC: optical coupler; TOF: tunable optical filter.

CREDIT
by Lingzhi Li, Yuan Cao, Yanyan Zhi, Jiejun Zhang1, Yuting Zou, Xinhuan Feng, Bai-Ou Guan and Jianping Yao
The system consists of a single spatial loop, in which two equivalent polarimetric loops are formed by recirculating light waves of orthogonal polarization states in the loop. To achieve PT symmetry, the phase retardance, power ratio, and coupling coefficient between the orthogonally polarized light waves are tuned by controlling PC1 in the birefringent path, and the lasing threshold is tuned by controlling PC2 in the coupled path. PC: polarization controller; Pol.: polarizer; EDFA: erbium-doped fiber amplifier; OC: optical coupler; TOF: tunable optical filter. CREDIT by Lingzhi Li, Yuan Cao, Yanyan Zhi, Jiejun Zhang1, Yuting Zou, Xinhuan Feng, Bai-Ou Guan and Jianping Yao

Abstract:
Parity-time-symmetric photonic and optoelectronic systems is being intensively explored recently, which has been bringing about significant fundamental physics and technological outcomes. One of the main characteristics of a PT symmetric system is its effectiveness in mode selection in a single-mode lasing, in which two cross-coupled and spatially separated resonators with identical geometries are usually employed. A PT-symmetric laser system has a strongly enhanced gain difference between the dominant mode and the side modes, thus making single-mode oscillation possible. However, the strict requirements not only lead to increased structural complexity, high cost, and strong susceptibility to environmental perturbations, but also limit the compactness when on-chip devices are required.

Polarimetric parity-time-symmetric photonic system

Changchun, China | Posted on October 9th, 2020

In a new paper published in Light Science & Application, a team of scientists, led by Professor Jiejun Zhang from Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University has proposed a new technique to realizing PT symmetry in a single spatial resonator. By the manipulation of the polarization-dependent response of the spatial resonator, localized eigenfrequencies, gain, loss, and coupling coefficients of two polarimetric loops formed by lights of orthogonal polarization states can be tuned to achieve PT symmetry. The proposed polarimetric PT symmetry concept opens new avenues for the implementation of non-Hermitian photonic systems, in which a variety of optical parameters, including polarization, wavelength, transverse mode and optical angular momentum, can be used.

As a demonstration, a fiber ring laser based on this concept supporting stable and single-mode lasing without using a high-Q optical filter is implemented. The PT-symmetric system is implemented in a single fiber loop with polarimetric diversity. In the experiment, the fiber ring laser has a cavity length of 41 m with a mode spacing as small as 4.88 MHz. The employment of polarimetric PT symmetry enables effective suppression of the sidemodes with a suppression ratio greater than 47.9 dB. The linewidth of the light generated by the fiber ring laser is measured to be 129 kHz with a wavelength-tunable range of 35 nm.

"In one single physical fiber loop, the polarimetric diversity is implemented by controlling the polarization states of light via polarization controllers. An erbium-doped fiber amplifier is incorporated to provide an optical gain. By tuning the loss, gain and coupling strength of the two polarimetric modes, PT symmetry is implemented, of which can be observed from the output spectrum. Since only a single physical loop is required, the implementation is significantly simplified, and the stability is highly improved."

"The measured laser linewidth is 129 kHz, which is broadened due to the high susceptibility of the system to environmental disturbances due to a long fiber in the cavity. By suppressing those noises using active cavity stabilization techniques or isolated laser systems, the linewidth is possible to be reduced to its Lorentzian linewidth of 2.4 kHz." they added.

"The presented technique provides a new concept of implementing PT symmetry in non-spatial parameter space in photonic systems. Not limited to the polarimetric parameter space, one can adopt this concept by constructing various parameter spaces. With simplified physical structures, this proposed concept is ready to be applied in other fields to promote the application of the PT symmetry mechanism." the scientists forecast.

####

For more information, please click here

Contacts:
Jiejun Zhang

Copyright © Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

RELATED JOURNAL ARTICLE:

Related News Press

News and information

Controlling chemical catalysts with sculpted light January 15th, 2021

Conductive nature in crystal structures revealed at magnification of 10 million times: University of Minnesota study opens up possibilities for new transparent materials that conduct electricity January 15th, 2021

Quantum computers to study the functioning of the molecules of life: A team of theoretical physicists from the University of Trento has shown that it is possible to use quantum computers to simulate processes of great biological importance, such as changes in the shape of protein January 15th, 2021

Keeping the costs of superconducting magnets down using ultrasound: Scientists show ultrasonication is a cost-effective approach to enhance the properties of magnesium diboride superconductors January 15th, 2021

Possible Futures

Scientists' discovery is paving the way for novel ultrafast quantum computers January 15th, 2021

Physicists propose a new theory to explain one dimensional quantum liquids formation January 15th, 2021

Controlling chemical catalysts with sculpted light January 15th, 2021

Conductive nature in crystal structures revealed at magnification of 10 million times: University of Minnesota study opens up possibilities for new transparent materials that conduct electricity January 15th, 2021

Optical computing/Photonic computing

USTC develops ultrahigh-performance plasmonic metal-oxide materials January 11th, 2021

Perfect transmission through barrier using sound: New study experimentally proved for the first time a century-old quantum theory that relativistic particles can pass through a barrier with 100% transmission December 29th, 2020

Experiment takes 'snapshots' of light, stops light, uses light to change properties of matter December 25th, 2020

Stevens creates entangled photons 100 times more efficiently than previously possible: Ultra-bright photon source brings scalable quantum photonics within reach December 17th, 2020

Discoveries

Physicists propose a new theory to explain one dimensional quantum liquids formation January 15th, 2021

Conductive nature in crystal structures revealed at magnification of 10 million times: University of Minnesota study opens up possibilities for new transparent materials that conduct electricity January 15th, 2021

Quantum computers to study the functioning of the molecules of life: A team of theoretical physicists from the University of Trento has shown that it is possible to use quantum computers to simulate processes of great biological importance, such as changes in the shape of protein January 15th, 2021

Keeping the costs of superconducting magnets down using ultrasound: Scientists show ultrasonication is a cost-effective approach to enhance the properties of magnesium diboride superconductors January 15th, 2021

Announcements

Controlling chemical catalysts with sculpted light January 15th, 2021

Conductive nature in crystal structures revealed at magnification of 10 million times: University of Minnesota study opens up possibilities for new transparent materials that conduct electricity January 15th, 2021

Quantum computers to study the functioning of the molecules of life: A team of theoretical physicists from the University of Trento has shown that it is possible to use quantum computers to simulate processes of great biological importance, such as changes in the shape of protein January 15th, 2021

Keeping the costs of superconducting magnets down using ultrasound: Scientists show ultrasonication is a cost-effective approach to enhance the properties of magnesium diboride superconductors January 15th, 2021

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Controlling chemical catalysts with sculpted light January 15th, 2021

Conductive nature in crystal structures revealed at magnification of 10 million times: University of Minnesota study opens up possibilities for new transparent materials that conduct electricity January 15th, 2021

Quantum computers to study the functioning of the molecules of life: A team of theoretical physicists from the University of Trento has shown that it is possible to use quantum computers to simulate processes of great biological importance, such as changes in the shape of protein January 15th, 2021

Keeping the costs of superconducting magnets down using ultrasound: Scientists show ultrasonication is a cost-effective approach to enhance the properties of magnesium diboride superconductors January 15th, 2021

Photonics/Optics/Lasers

Controlling chemical catalysts with sculpted light January 15th, 2021

USTC develops ultrahigh-performance plasmonic metal-oxide materials January 11th, 2021

Stretching diamond for next-generation microelectronics January 5th, 2021

Quantum wave in helium dimer filmed for the first time: Collaboration between Goethe University and the University of Oklahoma December 30th, 2020

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project