Chapter 12 provides an overview of fabrication techniques of integrated guided-wave photonic modulators, basic principles of modulation schemes and transmission medium, and single mode or few mode fibers. These chapters also investigate Si integrated photonic circuits (Si-PIC), which are currently attracting significant interest because of their integrability with CMOS micro-electronics. This technology may emerge as an essential technique to integrate both electronics and photonics on the same chip e-PIC (electro-photonic integrated circuits), leading to significant reduction of the total product cost using automatic CMOS technology production line.