Optoelectronic Circuits for Control of Lightwaves and Microwaves

Interaction of lightwaves are very important, especially in the area of optical fiber communication and microwave photonic systems. Optical modulation and demodulation based on lasers, modulators, photodiodes, etc., have been intensively investigated, so far. As a result, so many optoelectronic devices have been matured enough to be practically used in real optical communication systems. Now, we are ready to explore novel functional optoelectronic circuits combining these devices as primary elements. In this chapter, we describe recent progress of the optoelectronic circuits, which enhances functionalities of optical fiber communication/ microwave photonic systems, introducing our latest results. The first key word in this chapter is "data modulation/demodulation". Here, we describe novel optoelectronic circuits for advanced data modulation/demodulation. Our two approaches, multilevel signaling and spectral shaping, by the optoelectronic circuits are introduced. These technologies will be essentially useful to ultimately enhance spectral efficiency of the optical transmission systems, which is also applicable to microwave photonic systems. Another keyword is "photonic oscillators." If we consider communication systems, in general, oscillators are very important as much as the data modulation/demodulation. In the transmitter side, optical carrier should be provided; in the receiver side, local oscillators should be prepared for the demodulation. Stable and precise, and flexible in some cases, oscillators are always required both for the optical fiber communication and microwave photonic systems. Here, we describe novel photonic oscillator technologies based on optoelectronic circuits, featuring our two key technologies: One is an optoelectronic oscillator circuits and the other is an optical comb generation circuits. By the circuits, multi-frequency carrier can be easily and stably generated, which would greatly simplify the parts of photonic oscillators in the optical communication/ microwave photonic systems.

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