Direct Detection System
Direct detection systems are communication systems that detect modulated optical power, often referred to as intensity-modulation and direct-detection (IM-DD) systems, where a single photodiode is used
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Direct Intensity Modulation Fiber WDM
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Intensity Modulation / Direct Detection (IM/DD) is a scheme is simple and cost-effective in fiber optic communication, making it a suitable for various optical communication applications. It involves modulating the optical power of the carrier signal to represent the transmitted data. This modulation can be achieved using techniques, such as on-off keying (OOK). The intensity-modulated optical signal is generated by modulating the amplitude or the current of the light source, typically a laser diode with on
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1. Introduction Currently deployed fiber and free-space optical communication systems use on-off keying (OOK) with direct detection, and some are beginning to use differential phase-shift keying (DPSK)
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