IrDa

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TYP-478YXBY-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=5f088a8aed60f74180737ccde0de671f

Serial Infrared Physical Layer Specification, Version 1.4, Infrared Data Association,30 th May 2001.

http://en.wikipedia.org/wiki/Infrared_Data_Association Follow the linux links for chipsets implementing IRDA phy 

IrDa

MCS7780

http://soe.unn.ac.uk/ocr/downloads/partI-rev.pdf

http://tuxmobil.org/ir_misc.html

http://www.epanorama.net/links/opto.html

http://www.ee.washington.edu/circuit_archive/circuits/

http://electronicdesign.com/Articles/ArticleID/4525/4525.html