With the increasing use of lasers for short reach and high data rate transmissions on MM fibers, the need to characterize the spectra of these narrow coherent sources is also increasing. The impact on data transmission of launching conditions and of interference speckle patterns resulting from high coherence sources launched in MM fibers has been the subject of much study in the last few years. Information and references for such work can be found via the IEEE 802.3 10Gb / s on FDDI - grade MM fiber Study Group web site [1]. However, launching conditions and speckle also affect the measurement of the source spectra when using common monochromator- based Optical Spectrum Analyzers (OSA); such effects are often misunderstood or neglected. Recently in 2003, modifications have been proposed by Tatum [2], in order to adapt the TIA procedure for spectral characterization of laser diodes, FOTP - 127 [3], that dates back to 1991. The proposed modifications are aimed at mitigating the effects of unstable spectra observed with coherent sources used in high-speed multimode transmissions like VCSELs. In order to understand these effects and how not taking them into account can result in improper spectral characterization, it is necessary to understand how grating-based scanning-monochromator OSAs work and how their operation is affected by various launching conditions and speckle pattern noise.

© 2005 Optical Society of America

PDF Article
More Like This
1.6 mm Diameter Scanning Fiber Endoscope

Richard S. Johnston and Eric J. Seibel
FTuG5 Frontiers in Optics (FiO) 2005

Next Generation High-Speed Multimode Fiber Links and Their Specifications

Petar Pepeljugoski
OWH1 Optical Fiber Communication Conference (OFC) 2005

Differential Mode Delay (DMD) for Multimode Fiber Types and its Relationship to Measured Performance

Rick Pimpinella and Al Brunsting
NWF2 National Fiber Optic Engineers Conference (NFOEC) 2005


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access Optica Member Subscription