Optical Communications Green Book

Outline

Green Books are informational, non-normative, supportive documents to blue books

CCSDSCONCEPTPAPER

MISSION DEPLOYMENT

CCSDSDraftStandard(“Red”, “Pink”)

EXPERIMENTALDEPLOYMENT

Hard Requirement

Hard Requirement Prospective Requirement

CCSDSInformationalReport(“Green”)

CCSDSHistoric(“Silver”)

DECOMMITTEDDEPLOYMENT

CCSDSRecord(“Yellow”)

CCSDSDraftInformational

CCSDSExperimental(“Orange”)

CCSDSDraftPractice(“Red”, “Pink”)

CCSDSProposedStandard(“White”)

NORMATIVE TRACK NON-NORMATIVE TRACK

CCSDSRecommendedPractice(“Magenta”)

CCSDSProposedPractice(“White”)

CCSDSRecommendedStandard(“Blue”)

• CCSDS INFORMATIONAL (GREEN BOOK)

• The “informational” document designation is intended to provide for the timely publication of a very broad range of general information for the CCSDS community.

• Informational documents are often published in support of an experimental specification, a Draft Recommended Standard, or a Recommended Standard.

• They may therefore contain overview or descriptive material, supporting analysis, requirements, descriptions of use, scenarios, etc., which are otherwise inappropriate for the contents of a normative technical specification.

From CCSDS Optical Communications (OPT) Working Group Concept Paper

Title: Optical Communications Concepts and Terminologies

Document Type: Green Book

Description of Document: This Green Book will define common terminology and atmospheric models to be used in link and pointing budget calculations and define a basic concept of operations, including handovers from one location to the next. For glossary and terminology issues SANA will be consulted in coordination.

Contents of the Green Book:

Terminology Definition Atmospheric Models Link and Pointing Budget Calculation Examples of Concepts of Operations A)

Optical Communication Green Book Writing Philosophy

1. Description of parameters (terms) specified in Blue Books– Example:

2. Common Atmospheric Models recommended to support optical links selection during preparatory and hand-off planning

– Utilizing measured atmospheric parameters data defined in Atmospheric Green Book

3. Links Budgets template with an example– Defining common parameters to be used for links budgets

generation for various scenarios

4. Typical ConOps stages description– Coordinated with ConOps normatives specified in Blue Books

Details of Terminology Section

– Physical Layer Terminology• Clock Description (Rate, Jitter, Drift)• Communication Pulse (Shape,

Modulation Format and Rate)• Optical Characteristics (wavelength,

Polarization, Linewidth, etc)– Digital Domain Terminology

• Data Rates• Data Framing• Coding Description • Description of Interleaving Process• In-band Command and Telemetry

Processing

– Performance Metrics• EIRP • PFD • Implementation Penalties • Error Rates

– PAT Terminology• Beacon (configuration,

Spectrum, Power, Modulation)• Pointing (Ephemeris, Scanning)• Acquisition (Spatial, Clock and

Frame)• Tracking (Coarse, Fine)

List below is notional. It will include parameters matching those defined in Blue Books

Atmospheric Optical Channel Models

– CFLOS Model– Atmospheric Loss Model– Turbulence Model(s)

– Measured parameters defined in Atmospheric Green Book are inputs to models

– Models’ outputs directly or indirectly define link budget parameters

Link and Pointing Budget Template– Defines common parameters to be used to construct various types of link

budgets– Example from Optical Link Study Group’s (OLSG) Final Report

ConOps Example– Links Selection (t = t0 – x hours)

• Laser Safety activities• CFLOS and Atmospheric Turbulence• Ephemeris Data Distribution

– Links Establishment (t = t0 – y minutes)• Initialization (Pointing)• Acquisition• Tracking

– Links Operation (t = t0 +)• Data Communication• Telemetry Exchange• Handover

– Links termination and post operation (t = t0 + T)• Links Graceful Termination• Links Performance Correlation with Atmospheric Statistics and Atmospheric Models

updates • Post Operation Maintenance

t0 – start of communicationT – operation length