A year and a half ago I graduated college with a degree in EE and started working at a big company in my home town. At the time, my father was terminally ill with cancer (which was a large factor in me taking a job in my hometown). 4 months after I started, he passed away. Needless to say, my training was slower than it would have been under normal circumstances, and my work suffered a lot due to grief/depression over the next few months.
I only really told my direct supervisor, my team manager, and a couple close co-workers about my situation, and only right before my father passed. They were very understanding for a while, but it seems as though it didn't take long for them to forget that I was grieving. I am not the type to make excuses, so when I had trouble focusing and didn't accomplish much, I never blamed it on my loss.
Now that it doesn't have such a profound impact on my daily work, I've found that my supervisor is very slow to give me new responsibilities. I tell him on a fairly regular basis that I need more work, but I get maybe 70% of the work load that my peers get. I believe they have all formed the opinion that I am incapable of getting much work done, not realizing that my situation was temporary even if it was long.
How can I convince my supervisor that I can handle more urgent tasks if he wont give them to me?