What are the factors that contribute to an optical receiver's sensitivity?

The factors that contribute to an optical receiver's sensitivity are closely related to how effectively the receiver can detect and process the incoming optical signal. Responsivity, which refers to the ratio of output current to input optical power, is critical because higher responsivity means that the receiver can convert more of the incoming light into an electrical signal, enhancing sensitivity.

Noise is another pivotal factor; it characterizes the unwanted signals that can obscure the desired signal. The overall sensitivity of the receiver is determined by the signal-to-noise ratio (SNR), so lower noise levels lead to better detection of weak signals.

Response time is significant in determining how quickly the receiver can react to changes in the optical signal. If the response time is too slow, certain signal features may be missed, which negatively impacts sensitivity.

Linear response refers to the ability of the receiver to maintain a consistent output for a varying range of input powers. Non-linear responses can lead to distortion, making it harder to detect signals.

Back reflection is also important because reflected light can interfere with the incoming signal, affecting the overall performance of the optical receiver. The optical detector material plays a role in determining responsivity and how efficiently it converts light into an electrical signal, thus impacting sensitivity.

In summary, these factors collectively