Optical network architecture

The basic structure of the type of optical network with a star, bus type (including ring) and the other three tree species, can be combined into a variety of complex network structures. Transverse optical network can be divided into the core network, metro / access networks and local networks. Network structure tend to use the core network, metro / local network to use more ring structures, access network will be a combination of ring and star-shaped composite structure. Optical network can be vertical stratification of client layer, optical channel layer (OCH), optical multiplex section layer (OMS) and optical transmission section layer (OTS) and other layers. Between two adjacent layers constitute a client / server layer relationship.
Client tier: customers from a variety of different signal formats (such as SDH, PDH, ATM, IP, etc.).

Optical channel layer: a variety of different formats for the transparent transport layer signals to customers to provide end to end networking of optical channels, this layer is also generated and inserted the optical channel configuration overhead, such as wavelength markers, port connectivity, load signs (rate , format, line coding) and wavelength protection, etc. this layer contains OXC and OADM-related functions.

Recovery of the layer: the multi-wavelength optical signal to provide networking capabilities, including the insertion of various sections to ensure signal integrity layer overhead, and multiplex section layer provides survivability, wavelength multiplexers and efficient cross-connector is this layer.

Optical transmission section layer: optical signals in a variety of optical media (such as G.652, G.653, G.655 fiber) to provide transfer functions, the functions provided by optical amplifiers belong to this layer.

From the applications point of view, optical network will follow the "local network backbone network → → → Metro → CPN access network," the gradual penetration of the order.