IEC 62148-11:2009 covers physical interface specification for modulator integrated laser diode transmitters. The object of this standard is to adequately specify the physical requirements of an optical transmitter that will enable mechanical interchangeability of transmitters complying with this standard both at the printed circuit board and for any panel mounting requirement. This second edition cancels and replaces the first edition. The first edition was limited to 14-pin modulator-integrated laser diode transmitters. The second edition has been expanded to include 14-pin pump lasers and the title changed to reflect the new scope. This publication is to be read in conjunction with a href='http://webstore.iec.ch/webstore/webstore.nsf/artnum/028558'IEC 62148-1:2002/a.