• Sensitivity Limitations:Compared to active receivers, passive receivers generally exhibit lower sensitivity, limiting their use in low-light conditions or long-distance transmission.
• Dynamic Range Constraints:The range of input optical powers that can be accurately detected is often limited, making it challenging to handle signals with large variations in power.
• Temperature Dependence:The performance of some passive receivers can be affected by temperature variations, potentially impacting their sensitivity and stability.  
• Noise Considerations:Various noise sources, such as thermal noise, shot noise, and dark current, can degrade the signal quality and limit the receiver's sensitivity.  
• Integration Challenges:Integrating passive receivers with other components in complex systems can sometimes be challenging, especially in space-constrained environments.

There is an applications and maintenance guide to passive optical receivers .