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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 19 — Sep. 23, 2013
  • pp: 22327–22337

Distributed Bragg reflector structures based on PT-symmetric coupling with lowest possible lasing threshold

Mykola Kulishov and Bernard Kress  »View Author Affiliations


Optics Express, Vol. 21, Issue 19, pp. 22327-22337 (2013)
http://dx.doi.org/10.1364/OE.21.022327


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Abstract

A new approach towards the design of optimized distributed Bragg reflector (DBR) structures is proposed by taking advantage of recent developments related to the concept of parity-time (PT) in optics. This approach is based on using unidirectional gratings that provide coupling between co-propagating modes. Such couplers with PT symmetric gratings can provide co-directional mode coupling occurring only in one direction. This specific coupling property is achieved through a combined contribution of superimposed index and gain/loss modulations with same grating periodicity, but shifted with respect to one another by a quarter periods. Based on the transfer matrix approach, the transmission and reflection properties of the structure are modeled. One of the unique characteristics of the structure is very low lasing threshold. Such low threshold can be achieved by 100% reflectivity of the both Bragg grating mirrors, and by releasing the amplified signal in one single direction through a PT symmetric grating assisted co-directional coupler. Besides the lasing applications, the proposed structure can be implemented as an optical memory unit of replicating any input optical waveform.

© 2013 Optical Society of America

OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(050.2230) Diffraction and gratings : Fabry-Perot
(130.0130) Integrated optics : Integrated optics
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(200.0200) Optics in computing : Optics in computing
(200.4490) Optics in computing : Optical buffers

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: May 28, 2013
Revised Manuscript: August 7, 2013
Manuscript Accepted: September 5, 2013
Published: September 16, 2013

Citation
Mykola Kulishov and Bernard Kress, "Distributed Bragg reflector structures based on PT-symmetric coupling with lowest possible lasing threshold," Opt. Express 21, 22327-22337 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-19-22327


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