A broad range tuning of over 100 nm in tunable DBR lasers with superst
ructure grating (SSG) is reported. The SSG reflectors for 100 nm were
designed and patterned by electron beam lithography. 1.55 mum DBR lase
rs with SSG reflector operate in a single mode with a tuning range of
83 nm under CW conditions. With inclusion of the multimode operating r
egion, the tuning range becomes as wide as 103 nm.