After a disappointing two-year spell with McLaren, the Finn switched to the start-up team last season where alongside Jarno Trulli they want Lotus to step into the midfield in 2011.
"I feel that my career is back on the rise," Kovalainen told Finnish newspaper Turun Sanomat. "I've consolidated my position after what happened at McLaren and my feeling is very positive."
The 29-year-old also sounded happy about staying with Team Lotus in the future.
"I have not looked anywhere else, I like it with this team," said Kovalainen. "I'm not thinking about anything else, even in a not-serious way.
"We are right on track with what we have had to do and where we are going, so why would I have to go somewhere else," he added.
It really was not a bad idea to come to this team
"But the truth is that I am quite happy, it really was not a bad idea to come to this team," he said.
Turun Sanomat said the T128 car will have a new diffuser and exhaust for May's Spanish Grand Prix, delivering up to 8 tenths per lap.