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My remote control works on 40khz and it send 12 bit of information.So does 40khz mean i can send (approx)40000 bit per second,am i right or wrong.Thank you in advance
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.So does 40khz mean i can send (approx)40000 bit per second,am i right or wrong.

Wrong.

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A common modulation scheme for IR communication is something called 38kHz modulation. There are very few natural sources that have the regularity of a 38kHz signal, so an IR transmitter sending data at that frequency would stand out among the ambient IR. 38kHz modulated IR data is the most common, but other frequencies can be used.
https://learn.sparkfun.com/tutorials/ir-communication/all

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yes,we modulating the signal.Right.i have an obscure  vision on  mudulation ever since i heard that term.Actually,instead of on IR light for certain time to indicate one.we are on and off the IR light.MY question is for ON it should blink for 600us means,how many clyces on and off ,does it take for 38khz .does it take completely 38 cyles for one on and off.please explain me.Thank you
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Refer to the link I provided on a PC with a browser that can manage webpage graphics.
In the section Below is conceptual view of how an IR transmitter receiver pair works.
watch the animation... observe for every modulation pulse, the IR LED is pulsed.  Look at the receiver. 
It integrates the pulses to decode the original information.

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Another good resource for IR basics (google: sb projects ir)...all you need to know and more...
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Blog: http://www.AnalysIR.com/blog/     Twitter: @AnalysIR
Read => 10 common pitfalls with Infrared Remote Control :  http://bit.ly/1cvd0at

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