Ciena follows simple interview process. Consist of 2 technicals , 1 manager and 1 HR round . I was interviewed for java team, so they asked the core java. It involved Muti threading, Design Patterns.Second round was related to the project i was doing in my current company. Interview level is average.Second round, they asked me to write some java programs.Reason for looking out or the change. In manager round, he asked me 2 data structure problem. (Very easy) .and discuss on notice period. HR round is just for name sake. If you clear 2 technical then you are 95% in.