METHOD AND SYSTEM FOR PROVIDING ELECTROMAGNETIC INTERFERENCE (EMI) SHIELDING IN AN OPTICAL COMMUNICATIONS MODULE

摘要

An optical communications module is provided with an EMI shielding system that comprises a resistive coating disposed on one or more inner surfaces of the module housing. The resistive coating has a thickness that is greater than or equal to one skin depth and has a resistivity that is low enough to support electrical current flow, but high enough to absorb EMI radiation of a particular wavelength or wavelength range. The combination of these features causes EMI radiation to propagate in the resistive coating due to skin effect. The resistive coating absorbs at least a portion of the EMI radiation propagating therein.

主权项

1. An optical communications module comprising:
an optical communications module housing; and a resistive coating disposed on at least one inner surface of the housing, the resistive coating having a thickness that is equal to or greater than one skin depth, the resistive coating having a resistivity that ranges from about 10 ohm-meter to about 400 ohm-meter, and wherein the resistive coating absorbs at least a portion of electromagnetic interference (EMI) radiation produced by at least one source of EMI disposed on or in the optical communications module.