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Rapid Spectrum Analysis of Light From Emitters for Fiber-Optic Communications

IP.com Disclosure Number: IPCOM000064714D
Original Publication Date: 1985-Aug-01
Included in the Prior Art Database: 2005-Feb-19

Publishing Venue

IBM

Related People

Authors:
Corti, WD Hussain, MI Hutt, GW LaFalce, RA [+details]

Abstract

An important characteristic of LEDs (light emitting diodes), when employed as fiber-optic transmitters, is the location and width of their optical power in the electromagnetic spectrum. Typical LEDs emit in the 850 or 1300 nm wavelength regions, with their spectral power output having a Gaussian distribution about some center wavelength (CWL) at which the radiated power is greatest. The useful spectrum about this CWL is usually defined as all wavelengths containing no less than half of the power in the CWL. Spectral width or FWHM (full width of the spectrum at half of maximum power) plots are illustrated for reference in Fig. 1. Presently available commercial measurement equipment for CWL or FWHM requires in the order of 10 to 15 minutes to complete such plots as illustrated by Fig. 1.