So finally after days and months of looking for a 100mbps sfp module for mikrotik routerboards! Finally I have found a "special type" of sfp that does fiber at 100mbps but makes connection to board at 1G as per previous post.Its called SGMII sfps.
http://www.eoptolink.com/products/sgmii-sfp
Please check out the above link.Now can anyone from Mikrotik confirm me if routerboard supports SGMII?

While it depends on the switch chip, I believe all do.
What Mikrotik to you have?

While it depends on the switch chip, I believe all do.
What Mikrotik to you have?

Rb3011uias rm

You should be good to go - the 3011 has the IPQ-8064, which supports SGMII.

Have you seen this thread: viewtopic.php?f=2&t=122298#p606404

Have you seen this thread: viewtopic.php?f=2&t=122298#p606404

How is it relevant to sgmii sfp?

You should be good to go - the 3011 has the IPQ-8064, which supports SGMII.

Now I can't find Bidi sgmii sfps! Most are out of stock.If you can find then please tell me.1550tx/1310rx single mode single fiber