Optical communication technology has been extensively developed over the last 50 years, since the proposed idea by Kao and Hockham [1]. However, only during the last 15 years have the concepts of communication foundation, that is, the modulation and demodulation techniques, been applied. This is possible due to processing signals using real and imaginary components in the baseband in the digital domain. The baseband signals can be recovered from the optical passband region using polarization and phase diversity techniques, as well as technology that was developed in the mid-1980s.

The principal thrust in the current technique and technology differs distinctively in the processing of baseband signals in the discrete/sampled digital domain ...

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