Intraband and interband optical crosstalk in multiwavelength optical cross connects using tunable fiber bragg gratings and optical circulators

Xiangnong Wu, Chao Lu, Z. Ghassemlooy, Yixin Wang

Research output: Journal article publicationConference articleAcademic researchpeer-review


Fiber Bragg grating (FBG) based wavelength division multiplexer (WDM) optical cross connect (OXC) is of great importance, which has the advantages of good performance and potential low cost. Optical crosstalk plays a major role in limiting practical implementations of an OXC. Crosstalk analyses presented so far generally focus on the traditional multiplexer/demultiplexer and optical switch based OXC architecture. In this paper, optical crosstalk in multiwavelength reconfigureable nonblocking OXCs using tunable FBGs and optical circulators (OCs) is discussed. Two crosstalk mechanisms, intraband and interband, are identified and analytical models are presented. Both first-order and second-order crosstalk contributions have been studied. For the intraband crosstalk, results show that the worst case coherent crosstalk is the dominant crosstalk, which is ∼ 23 - 25 dB higher than the incoherent crosstalk, depending on the switching states of the 2 × 2 OXCs. For the interband crosstalk, results show that it is nonaccumulative and becomes very small with the increase of the number of fibers or the cascaded stages of 2 × 2 OXCs. However it deteriorates with the increase of the number of wavelengths per fiber.
Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1 Dec 2001
Externally publishedYes
EventPhotonics Technology in the 21st Century - Singapore, Singapore
Duration: 27 Nov 200129 Nov 2001


  • Fiber Bragg grating
  • Interband crosstalk
  • Intraband crosstalk
  • Optical circulator
  • Optical cross connect
  • Wavelength division multiplexing (WDM)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this