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Impairments and Other Constraints on Optical Layer Routing (RFC4054)

IP.com Disclosure Number: IPCOM000124831D
Original Publication Date: 2005-May-01
Included in the Prior Art Database: 2005-May-10
Document File: 30 page(s) / 73K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Strand: AUTHOR [+4]

Abstract

Optical networking poses a number challenges for Generalized Multi- Protocol Label Switching (GMPLS). Fundamentally, optical technology is an analog rather than digital technology whereby the optical layer is lowest in the transport hierarchy and hence has an intimate relationship with the physical geography of the network. This contribution surveys some of the aspects of optical networks that impact routing and identifies possible GMPLS responses for each: (1) Constraints arising from the design of new software controllable network elements, (2) Constraints in a single all-optical domain without wavelength conversion, (3) Complications arising in more complex networks incorporating both all-optical and opaque architectures, and (4) Impacts of diversity constraints.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 4% of the total text.

Network Working Group                                     J. Strand, Ed.
Request for Comments: 4054                                  A. Chiu, Ed.
Category: Informational                                             AT&T
                                                                May 2005


      Impairments and Other Constraints on Optical Layer Routing

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   Optical networking poses a number challenges for Generalized Multi-
   Protocol Label Switching (GMPLS).  Fundamentally, optical technology
   is an analog rather than digital technology whereby the optical layer
   is lowest in the transport hierarchy and hence has an intimate
   relationship with the physical geography of the network.  This
   contribution surveys some of the aspects of optical networks that
   impact routing and identifies possible GMPLS responses for each:  (1)
   Constraints arising from the design of new software controllable
   network elements, (2) Constraints in a single all-optical domain
   without wavelength conversion, (3) Complications arising in more
   complex networks incorporating both all-optical and opaque
   architectures, and (4) Impacts of diversity constraints.

Table of Contents

   1.  Introduction .................................................  2
   2.  Sub-IP Area Summary and Justification of Work ................  3
   3.  Reconfigurable Network Elements ..............................  3
       3.1.  Technology Background ..................................  3
       3.2.  Implications for Routing ...............................  6
   4.  Wavelength Routed All-Optical Networks .......................  6
       4.1.  Problem Formulation ....................................  7
       4.2.  Polarization Mode Dispersion (PMD) .....................  8
       4.3.  Amplifier Spontaneous Emission .........................  9
       4.4.  Approximating the Effects of Some Other
             Impairments Constraints ................................ 10
       4.5.  Other Impairment Considerations ........................ 13


Strand & Chiu                Informational                      [Page 1]
RFC 4054                 Optical Layer Routing                  May 2005


       4.6.  An Alternative Approach - Using Maximum
             Distance as the Only Constraint ........................ 13
       4.7.  Other Conside...