OPTICAL NETWORK INTERFACE MODULE USING A HARDWARE PROGRAMMABLE OPTICAL NETWORK INTERFACE ENGINE

摘要

An optical network interface (ONI) module has two main components: an optoelectronic front-end and a general purpose hardware-programmable optical network interface engine. The ONI engine is hardware programmable, allowing the user to configure the overall ONI module with different optoelectronic front-ends and for use with different host modules. In this way, the ONI module can be configured for different applications and protocols. In some implementations, the ONI module may include a burst mode clock recovery module that recovers the clock rapidly and with a small number of preamble or overhead bits at the front end of the data. In one approach, a local clock is used for timing when the recovered clock is not available. Transitions between the recovered clock and local clock are smoothed out to avoid undesirable artifacts