StratixIV GX and SFP

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In my design, the stratix IV GX is used.

The stratix IV GT is used in the Altera development board which I can refer.

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Ok, thanks for the clarification.

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The transciever power supply is 1.5V in my design. Based on your advice, the AC couple mide will be used.

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What is "my design"? The Stratix IV GX design, or the Stratix IV GT kit?

In my constraints file for the GX kit I have:

   #  The GXB voltages can be selected by DIP switches on the boards, eg.
   # 
   #   VCCH = 1.4V (default) or 1.5V (reserved)
   #   VCCA = 2.5V           or 3.0V (default)
   # 
   #  Quartus Assignments->Device, Operating Settings and Conditions,
   #  Voltage shows the default settings are 1.4V and 2.5V.
   #  Explicitly assign them per the DIP switch defaults.
   # 
    set_global_assignment -name VCCH_GXBL_USER_VOLTAGE 1.4V
    set_global_assignment -name VCCH_GXBR_USER_VOLTAGE 1.4V
    set_global_assignment -name VCCA_L_USER_VOLTAGE    3.0V
    set_global_assignment -name VCCA_R_USER_VOLTAGE    3.0V

And if I look at the Altera Stratix IV GT SI kit schematic, I see that VCCH = 1.4.

So why do you think it is 1.5V?

Cheers,

Dave