Network Working Group Qilei Wang
Internet-Draft Xihua Fu
Intended status: Standards Track ZTE Corporation
Expires: August 29, 2013 Feb 25, 2013
OSPF extensions for support spectrum sub-band allocation
draft-wang-ccamp-flexigrid-wavelength-range-ospf-02.txt
Abstract
This document addresses the requirements and routing protocol
extension of spectrum sub-band allocation in order to help reduce
non-linear effect and raise spectrum utilization rate in the scenario
of indiscriminately positioning of various channels with different
bit rates.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions used in this document . . . . . . . . . . . . . . 4
3. Overview of the Solution . . . . . . . . . . . . . . . . . . . 5
4. Extension of routing protocol . . . . . . . . . . . . . . . . 6
4.1. Relationship with WSON . . . . . . . . . . . . . . . . . . 6
4.2. Extensions of OSPF Protocol to Support Spectrum Group
Allocation . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2.1. Spectrum sub-band Allocation by Bitrates . . . . . . . 7
5. Security Considerations . . . . . . . . . . . . . . . . . . . 9
6. IANA considerations . . . . . . . . . . . . . . . . . . . . . 9
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.1. Normative References . . . . . . . . . . . . . . . . . . . 9
7.2. Informative References . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10
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1. Introduction
In current DWDM systems, completely freedom and indiscriminate
positioning of various channels with different bit rates is likely to
lead to dramatically impaired system performance due to XPM (Cross-
phased Modulation) effect and low spectrum utilization rate.
Cross phase modulation (XPM) is known as the phenomenon that
variations of intensity of one optical signal can change the
refractive index of the fiber, and modulate the phase of the other
optical signals co-propagating in the same fiber.
When DWDM was first introduced, the typical wavelength date rate was
2.5Gb/s. 10Gb/s wavelength was enabled because of the development of
higher performance optical modulators. However, the same simple
modulation format was used at both 2.5Gb/s and 10Gb/s. The
modulation technique is Intensity Modulation with Direct Detection
(IM-DD). Barrier appeared if we want a wavelength to transport data
with 40 Gb/s bitrate or more.After years of development, coherent
technology is introduced to broken the limit for 40Gb/s and soon for
100Gb/s transmission.
Intensity modulation direct detection (IM-DD) systems are less
sensitive to the variation of phase of the signal and is going to
bring the variation of the intensity, then the changes of refractive
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