Performance Monitoring in Photonic Networks

John Drake

Chromisys

3/22/00 Performance Monitoring in Photonic Networks in Support of MPL(amda)S 2

Current Networking

CrossConnect

SONETMuxes

DWDMCross

ConnectSONETMuxes

DWDM

Packet SONET Photons SONET Packet

Routers Routers

3/22/00 Performance Monitoring in Photonic Networks in Support of MPL(amda)S 3

Photonic Networking

Routers Routers

Packet Photons Packet

PhotonicSwitch

PhotonicSwitch

PhotonicSwitch

3/22/00 Performance Monitoring in Photonic Networks in Support of MPL(amda)S 4

Photonic Network Model

Router

ATMswitchPXC

Router

Router

ATMswitch PXC

OADM

PXC Photonic SwitchDWDM Dense Wavelength Division MultiplexerOADM Optical Add Drop Multiplexer

Control Plane Flows

Proprietary Signaling

DWDM DWDM

OXC

3/22/00 Performance Monitoring in Photonic Networks in Support of MPL(amda)S 5

Photonic Network Model Advantages

• Supports Overlay Model and Peer Model• Overlay

Photonic Switch computes the path Network-level abstraction

• Peer Router computes the path

(The router has enough information about the characteristics of the optical devices/network)

Link-level abstraction

3/22/00 Performance Monitoring in Photonic Networks in Support of MPL(amda)S 6

Challenges of Photonic Networks

• Optical layer information not available• SONET

Is unaware of optics Makes network opaque

• Digital wrappers don’t offer a solution either• Provisioning, switching, management and monitoring

functions need to move to optical domain

3/22/00 Performance Monitoring in Photonic Networks in Support of MPL(amda)S 7

Proposed Optical Parameters

• Dispersion (chromatic and Dispersion Mode)• Optical power level and signal-to-noise ratio (OSNR)• Bit rate• Q-Factor• Wavelength registration• Wavelength selective component drift• Optical cross talk• Optical power transients• Bit error rate• Jitter• Insertion loss

3/22/00 Performance Monitoring in Photonic Networks in Support of MPL(amda)S 8

Control Plane

• Control plane used to communicate, monitoring is done on the actual wavelength

• Flows to be supported Router - PXC PXC – DWDM PXC - PXC

• DWDM systems can continue to use proprietary implementations ([de]mux – oamp – oadm)

• Out-of-band on dedicated standard ITU channel

3/22/00 Performance Monitoring in Photonic Networks in Support of MPL(amda)S 9

For Further Study

• Final List of optical parameters• Agreed techniques for measurements of optical

parameters• Synthesis of optical parameters for link state

database and network management• Interface between PXC and DWDM