infrared transceiver

hi...currently doin a proj regading infrared transmission.here a prob would like to ask for help...i m using HSDL-1100 infrared transceiver to establish a infrared transmission.it seems no pron in transmitter end but the receiver end is easily susceptible to noise.i m quite sure these noise come from flourescent light.because when i switch off the light then everything all right.however this infrared transceiver is designed to has immunity of sunlight or flouresescent light.anyone can tell me y?thanks in advance....

I'm not familiar with that device, but usually IR transmissions use a carrier frequency to help avoid external light problems - commonly 38KHz in normal TV remotes.

But IR sensors are generally sensitive to visible light as well, they just have a reduced sensitivity to it.

You could put a filter over it. It's just a piece of plastic that absorbs most visible light.