The FPT3515c is a monolithic Indium Phosphide tunable transmitter with chirp control. The tunable transmitter is electronically tuned and can address any wavelength in the C-band. Flexible control of the output power and shutter functions are realized through use of variable optical attenuators, enabling dark tuning between channels. The transmitter can be used in zero or negative chirp at NRZ data rates up to 13.5 Gbps. The device is packaged into a compact TOSA-style package, with an internal optical isolator.