Idivayisi iyimojula ye-silicon avalanche photodiode enamayunithi amane afanayo, enesekethe esakhelwe ngaphakathi se-preamplifier, engakhulisa isignali yamanje ebuthakathaka futhi iyiguqule ibe okukhiphayo kwesignali kagesi, ibona inqubo yokuguqula "i-optical-electrical-signal amplification".