The M-APE-I-1550-20 is a 20 GHz Intensity Modulator that is manufactured with Annealed Proton Exchange(APE) process, it features a zero-chirp design and Polarization Maintaining (PM) fiber output. M-APE-I-1550-20 features 20GHz E/O bandwidth, a highly linear transfer function and excellent extinction ratio. Applications include digital transmission up to 20 Gb/s, analog RFoF transmission to 18 GHz, optical pulse generation, modelocked fiber laser and microwave optical link. The M-APE-I-1550-20 is compatible with a wide variety of modulator drivers, and a separate bias port allows the modulator to operate at specific points of the transfer function. The M-APE-I-1550-20 Modulator is designed for external modulation of 1550 nm laser up to 18 GHz or 20 Gb/s. It is also applicable for pulse generation for Master Oscillator Power Amplifier(MOPA) configuration. Due to proprietary APE technology, M-APE-I-1550-20 can handle input power beyond 100 mW and is a bias-stabilized modulator. It has a wide operating temperature tolerance ranging from -25º to +70ºC.