Band-pass filter with flat time delay response based on fiber grating Sagnac loop

Xuewen Shu, Kate Sugden, Donghui Zhao, Lin Zhang, Ian Bennion

Research output: Chapter in Book/Published conference outputConference publication


We have developed the analytic expressions for the phase response and time delay of FBGSL of arbitrary grating structure and found that the results from the modelling are in excellent agreement with that of the experimentally measured real devices. The theoretical and experimental investigation clearly reveals that FBGSLs utilizing uniform and linearly chirped gratings exhibit a near-constant time delay in the passbands. Such multi-channel bandpass filters should be highly attractive to WDM applications as they are operating in transmission regime and offering near-zero dispersion.
Original languageEnglish
Title of host publicationOptical Fiber Communication Conference and Exhibit. OFC 2002
Number of pages2
ISBN (Print)1-55752-701-6
Publication statusPublished - 2002
EventOptical Fiber Communication Conference and Exhibit - Anaheim, CA, United Kingdom
Duration: 17 Mar 200222 Mar 2002


ConferenceOptical Fiber Communication Conference and Exhibit
Country/TerritoryUnited Kingdom
CityAnaheim, CA


  • band pass filters
  • bragg gratings
  • chirp
  • chirp modulation
  • delays
  • delay effects
  • fiber gratings
  • optical fiber devices
  • optical fiber dispersion
  • passband
  • phase measurement
  • pagnac
  • fibre dispersion
  • optical fibre filters
  • optical modulation
  • wavelength division multiplexing
  • WDM applications
  • analytic expressions
  • arbitrary grating structure
  • fiber grating Sagnac loop
  • linearly chirped gratings
  • modelling
  • multi-channel bandpass filters
  • near zero dispersion
  • near-constant passband time delay
  • phase response
  • time delay
  • transmission regime
  • uniform chirped gratings


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