An optical transmit assembly having a temperature sensor patterned on an electro-optic transducer die. Due to the close proximity of the electro-optic transducer junction and the temperature sensor, the temperature sensor more accurately measures the temperature of the electro-optic transducer junction. This permits for more refined control of the frequency characteristics of optical light emitted by the electro-optic transducer junction since the emitted optical frequencies of most electro-optic transducers are heavily temperature dependent.