scope:

This standard provides design requirements for digital fiber optic systems having data transmission rates not greater than 500 megabits per second (Mbps) installed aboard Navy surface ships and submarines. The proper application of component specifications and other fiber optic standards is addressed herein, as are detailed methods for calculating system design parameters, with examples. This standard concentrates on the design of a simple digital fiber optic link. It does not address most general system design issues such as the terminal equipment design (except for some physical design constraints), the system topology and the physical design of the fiber optic cable plant. It is assumed that these decisions have been made and the information is used as input to the link design process. Furthermore, this document does not address the design of analog links, links using step index fiber and complex fiber optic links containing nonlinear fiber optic components such as fiber amplifiers.

The design requirements in this document apply to equipment and systems on specific ships when invoked by the governing ship specification, system specification, or other contractual document. They are intended for new systems using fiber optics or the conversion or alteration of existing systems to use fiber optics. Where there is a conflict between this document and the ship specification or contract, the ship specification or contract shall take precedence. Where ship design or system performance requirements are such that the methods herein cannot be implemented, users shall submit new methods to Commander, Naval Sea Systems Command, 2531 Jefferson Davis Hwy., Arlington, VA 22242-5160 Attn: SEA 06K31 for approval.

This standard describes the methodology that is required for designing digital fiber optic transmission links with capacities up to approximately 500 Megabaud (Mbaud) which use either single mode or graded index multimode optical fiber and either a light emitting diode (LED) or laser source. This document concentrates on transmission wavelengths in the first and second transmission windows (850 and 1300 nanometers (nm)). The information may be applicable for links operating between 700 and 1600 nm. However, component specifications are normally provided in the 850 and 1300 nm windows only. The types of transmitters, fiber, and receivers available for use in links are addressed as well as the performance characteristics of any passive components within the link. In many cases, the link design will be an iterative process in which various trade-offs between system components are evaluated. For each link being designed, a unique design solution may not exist. Several solutions may be technically viable. The link designers must choose the solution that is best suited to the particular application.

intended Use: