We present here an all-integrated ETDM 40 Gbit/s optoelectronic transmitter module, which has been developed by the French RNRT ERMIONE consortium. This transmitter integrates the final three high speed functions - namely, the electrical multiplexer, the driver and the electro-absorption modulator - in a single compact and low-cost module. This device has permitted a 40 Gbit/s single channel error-free transmission over 300 km of Teralight fiber.