Before introducing coherent optical communication, let’s briefly introduce what coherent light is. We often talk about “coherence”, and everyone understands that it means “interrelated or involved”. Coherence of light means that two light waves meet the following three conditions at the same time in the process of transmission:
1. The frequency (wavelength) is the same;
2. The vibration direction is the same;
3. The phase difference is constant.
Such two beams of light can produce stable interference with each other during transmission. This interference can be either constructive interference (strengthening) or destructive interference (cancellation). As shown below:
It is obvious that constructive interference can make light waves (signals) stronger.
HTF can help you design coherent DWDM solution.
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