The following analysis examines the inevitability of the resale of used optical modules from three core scenarios, drawing an analogy to the used mobile phone market to help you better understand this phenomenon. In lab conditions some optics look effectively immortal, but in production the real limits are heat, contamination, mechanical handling, and. In the optical communication industry, the resale of used optical modules is no secret. Data centers, large enterprises, and operators are all driving this market's activity in various scenarios. Hi, We've been using for a long time transceivers (40G MPO) from an aftermarket vendor (fs. With rising hardware costs and shrinking budgets, many network operators, data centres and service. In fiber-optic networks, insertion loss (IL) and return loss (RL) are two critical metrics that every engineer must understand. While IL measures how much optical power is lost as it passes through a component, RL measures how much power is reflected back toward the transmitter. Some examples of these would be mechanical splices.