even in the input side there is no current flow

This makes it pretty clear that it's a simulation problem, not a circuit design problem.

Why don't you try doing some diagnostic tests to try to narrow it down? There are probably more possibilities, but the first two possible problems that come to mind are:
1) Proteus' opto model is inaccurate or incomplete.
2) Your input/output sources (the little blue flags that say "0" and mean absolutely nothing to be as someone who doesn't use Proteus) aren't set up correctly.

So, try a few tests to determine which of those it is, then dig deeper from there.

You could replace the input stage of the opto with a simple resistor. If current doesn't flow through the resistor, you know your little blue flag isn't working right. If current does flow through the resistor, then the flag seems to be working, and it's the opto model that's failing.

You could replace the little blue flag on the input side with a battery and ground connection, just like the one that worked in your TRIAC opto test. If you're able to get current through the opto input with that, then the problem is in whatever that little blue flag does. If not, again that would imply a problem with the opto model.

There may be better diagnostic tests - these are just quick first impressions. The point is: don't just set up the circuit you expect to work, see it fail, and give up. Try troubleshooting yourself. Find clues and evidence that get you closer to the root of the problem. If you're seriously interested in designing, building, or servicing electronics, you're going to have to do a lot of troubleshooting. Everyone makes mistakes, and any component or connection can fail at any time, so you have to be willing and able to break a problem down and check everything. Might as well start learning that now.

 

I've been trying to use the MCT2E optocoupler in my project but I am not getting any output response from it. I've converted in a simple circuit just to make it easier to solve the problem. Can anyone tell me what is the problem in this circuit?

As mentioned in post #3, it’s obvious from your image in post #1 that the voltage input to R1 is zero. So...you can’t expect any output except zero.

eT

 

i tried putting 220R resistor in R1 but also it is not working. perhaps the problem is with my proteus. i found a working circuit in the internet and tried to simulate that exact circuit in my proteus but it didn't work. i've attached the circuit which i tested simulating.

why are you using a Triac to switch a D.C. load?

Also,
In your simulation, The voltage source has no reference to ground.

eT