Abstract: This application note presents a new solution to maintaining constant optical output for laser diodes addressing high-speed, fiber-optic transmitter application. The solution involves using K-factor compensation to maintain laser extinction ratio by changing the modulation current in proportion to the bias current when closing the APC loop. The concept is discussed and experimental results are presented. This approach has been implemented in the MAX3863 2.7Gbps laser driver with modulation compensation. The application note you have requested is available in Acrobat PDF format: APPLICATION NOTE 1119: HFAN-02.2.1: Maintaining the Extinction Ratio of Optical Transmitters Using K-Factor Control (PDF, 56kB) A free Acrobat PDF reader is available from: http://www.adobe.com/products/acrobat/readstep.html Related Parts   APP 1119: Jun 21, 2002 MAX3737 Multirate Laser Driver with Extinction Ratio Control Full Data Sheet (PDF, 480kB) Free Samples MAX3863 2.7Gbps Laser Driver with Modulation Compensation Full Data Sheet (PDF, 428kB) Free Samples Automatic Updates Would you like to be automatically notified when new application notes are published in your areas of interest? Sign up for EE-Mail™. We Want Your Feedback!   Download, PDF Format (56kB)  AN1119, AN 1119, APP1119, Appnote1119, Appnote 1119