CableLabs publishes CPON coherent PON architecture specification

摘要

CableLabs has taken the first step in making its vision of coherent PON (CPON) a reality. The organization has released "Coherent Passive Optical Networks 100 Gbps Single-Wavelength PON - Coherent PON Architecture Specification" (CPON-SP-ARCH-101 -230503), which describes the architecture, use cases, and operational needs that will guide technology development of CPON point-to-multipoint optical transceivers. Coexistence with legacy PON technology as well as point-to-point coherent transmissions is a key requirement for CPON within the specification, according to Curtis Knittle, vice president, wired technologies research and development at CableLabs. The document references a Coexistence Element that will enable CPON transmissions to share the same fiber as current PON networks, but not how the element would work. That said, Knittle adds that CableLabs has performed coexistence testing of a coherent PON transmission with such traffic types. Among the keys to success, he says, will be avoiding such hazards as crosstalk.