An Optical Link Budget is the overall gains and losses within an optical network. Having this budget would than allow for the cost effective selection of transmitter, receiver (transceiver) at each end of a network.

You need to know the data for the single mode fiber transmistter and receiver losses. This is prinicpally based on the type of laser transmitter or receiver you are using. Then you perform the optical loss link budget calculation. You don't care about noise in the equation. You just know your power output in db, calculate all your db losses in the link to include receiver losses and determine if you have the necessary loss budget maintained-which is 3db.

The Production Budget for Stop-Loss was $25,000,000.

The Production Budget for The Loss of Sexual Innocence was $4,000,000.

If there is a 3db loss that means 50 percent of the light were lost.