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Contents NTask 2 has agreed some
goals
time variation mechanisms
tasks
Progress to date8'8
Goals Study the impact of time varying effects on the LRM draft spec
Provide input to the time varying component of the receiver compliance test
Set a frequency below which EDC should track (TP3 test rate)
Define tracking 'mask' - magnitude of perturbation vs frequency of perturbation
Measure spectrum of time variation effects
what is the product expected to cope with in real life ? what's already out there ?
consensus that measuring this for statistically significant numbers installed links would be an extremely difficult task;
Modeling of extent of time variance of links
e.g. delay vs mode sets for quasi-continuous perturbed link for listed mechanisms
generate impulse responses for quasi-continuously perturbed link for selected launches, over Cambridge fibre set (tbc) and a 'standard link'
Study modal noise of the MMF channel and ensure modal noise is properly accounted for in the LRM draft spec
Assess modal noise penalty for different laser types
Timeline - input to September interim meeting@L,-l6.@L,-l6.PO)Mechanisms leading to channel variability** 3Connector offset:
connector offset may be a gearing factor for temporal effects through mode selective loss and mode coupling
static offset 3.5um average, 1.8um standard deviation for 50 micron fibre (i.e. 95% less than 7um); scaling for 62.5 micron fibre ?
Fibre perturbation:
Fibre shaker (TIA/E!A-455-203) may be necessary part of task 2 measurements, may not be sufficient
May require a range of frequency and amplitude - 'perturbation mask'
large amplitude at low frequency, small amplitude at high frequency
Laser wavelength
Rapid changes in laser wavelength result in modal noise; variance can be estimated using previous modal noise work
Temperature
Evolution of channel characteristics as link and laser source temperature vary can be modeled
How fast and by how much does each vary in a realistic link ?ZlZZZZDZZsZZ_Z>ZlDs_>P3Tasks Real environments
What's already out there describing in-building environments ? existing standards ?
Measurements of spectrum of time variation effects - volunteers tbd
Mechanisms: determine mechanical vibration rates and amplitudes for each mechanism
Experiment: relationship of perturbation spectrum to modal noise spectrum for each mechanism
Modeling:
Generate delay vs mode sets, and impulse responses for quasi-continuous perturbation mechanisms, for selected launches, over Cambridge fibre set and 'standard link'
Effect of temperature (link and source) over 'standard link'
Modal noise: penalty for different laser types over 'standard link'
'Standard link' for modeling and experiment:" Z" Z" Z" Zq" Z
G
S8,>v Progress
eVolunteers actively working each task !
To date:
Identified existing standards describing in-building environments
GR-63-CORE -
describes office environment vibration tests at 'constant acceleration' (0.1G & 1G) from 5-100 Hz
(vibration amplitude ~ 1/f2 )
IEC 61300-2-1
max frequency 55Hz
'Standard link' for modeling and experiments is in progress
Includes polarization controller and fibre shaker
up to 3 connectors with worst case offset consistent with preceding standards and existing link specs
Proposed measurement technique to determine relationship of perturbation spectrum to modal noise spectrumV1!ZC" Z Z Z Z Z< Z Z Zj Z1C{J(J(<j d
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="3Task 2 update: Time variation and modal noise study
Contents YTask 2 has agreed some
goals
time variation mechanisms
tasks
Summary of progress to date8'C
Goals Study the impact of time varying effects on the LRM draft spec
Provide input to the time varying component of the receiver compliance test
Set a frequency below which EDC should track (TP3 test rate)
Define tracking 'mask' - magnitude of perturbation vs frequency of perturbation
Measure spectrum of time variation effects
what is the product expected to cope with in real life ? what's already out there ?
consensus that measuring this for statistically significant numbers installed links would be an extremely difficult task;
Modeling of extent of time variance of links
e.g. delay vs mode sets for quasi-continuous perturbed link for listed mechanisms
generate impulse responses for quasi-continuously perturbed link for selected launches, over Cambridge fibre set (tbc) and a 'standard link'
Study modal noise of the MMF channel and ensure modal noise is properly accounted for in the LRM draft spec
Assess modal noise penalty for different laser types
Timeline - input to September interim meeting@L,-l6.@L,-l6.PO)Mechanisms leading to channel variability** 3Connector offset:
connector offset may be a gearing factor for temporal effects through mode selective loss and mode coupling
static offset 3.5um average, 1.8um standard deviation for 50 micron fibre (i.e. 95% less than 7um); scaling for 62.5 micron fibre ?
Fibre perturbation:
Fibre shaker (TIA/E!A-455-203) may be necessary part of task 2 measurements, may not be sufficient
May require a range of frequency and amplitude - 'perturbation mask'
large amplitude at low frequency, small amplitude at high frequency
Laser wavelength
Rapid changes in laser wavelength result in modal noise; variance can be estimated using previous modal noise work
Temperature
Evolution of channel characteristics as link and laser source temperature vary can be modeled
How fast and by how much does each vary in a realistic link ?ZlZZZZDZZsZZ_Z>ZlDs_>P3Tasks Real environments
What's already out there describing in-building environments ? existing standards ?
Measurements of spectrum of time variation effects - volunteers tbd
Mechanisms: determine mechanical vibration rates and amplitudes for each mechanism
Experiment: relationship of perturbation spectrum to modal noise spectrum for each mechanism
Modeling:
Generate delay vs mode sets, and impulse responses for quasi-continuous perturbation mechanisms, for selected launches, over 'standard link'
Effect of temperature (link and source) over 'standard link'
Modal noise: penalty for different laser types over 'standard link'
'Standard link' for modeling and experiment:" Z" Z" Z" Zq" Z
G
S8,,, Progress
eVolunteers actively working each task !
To date:
Identified existing standards describing in-building environments
GR-63-CORE -
describes office environment vibration tests at 'constant acceleration' (0.1G & 1G) from 5-100 Hz
(vibration amplitude ~ 1/f2 )
IEC 61300-2-1
max frequency 55Hz
'Standard link' for modeling and experiments is in progress
Includes polarization controller and fibre shaker
up to 3 connectors with worst case offset consistent with preceding standards and existing link specs
Proposed measurement technique to determine relationship of perturbation spectrum to modal noise spectrumV1!ZC" Z Z Z Z Z< Z Z Zj Z1C{J(J(<j p p(
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="3Task 2 update: Time variation and modal noise study
Contents YTask 2 has agreed some
goals
time variation mechanisms
tasks
Summary of progress to date8'C
Goals Study the impact of time varying effects on the LRM draft spec
Provide input to the time varying component of the receiver compliance test
Set a frequency below which EDC should track (TP3 test rate)
Define tracking 'mask' - magnitude of perturbation vs frequency of perturbation
Measure spectrum of time variation effects
what is the product expected to cope with in real life ? what's already out there ?
consensus that measuring this for statistically significant numbers installed links would be an extremely difficult task;
Modeling of extent of time variance of links
e.g. delay vs mode sets for quasi-continuous perturbed link for listed mechanisms
generate impulse responses for quasi-continuously perturbed link for selected launches, over Cambridge fibre set (tbc) and a 'standard link'
Study modal noise of the MMF channel and ensure modal noise is properly accounted for in the LRM draft spec
Assess modal noise penalty for different laser types
Timeline - input to September interim meeting@L
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=]DChannel ad-hoc - Task 2 Time variation and modal noise study update
Contents YTask 2 has agreed some
goals
time variation mechanisms
tasks
Summary of progress to date8'C
Goals Study the impact of time varying effects on the LRM draft spec
Provide input to the time varying component of the receiver compliance test
Set a frequency below which EDC should track (TP3 test rate)
Define tracking 'mask' - magnitude of perturbation vs frequency of perturbation
Measure spectrum of time variation effects
what is the product expected to cope with in real life ? what's already out there ?
consensus that measuring this for statistically significant numbers installed links would be an extremely difficult task;
Modeling of extent of time variance of links
e.g. delay vs mode sets for quasi-continuous perturbed link for listed mechanisms
generate impulse responses for quasi-continuously perturbed link for selected launches, over Cambridge fibre set (tbc) and a 'standard link'
Study modal noise of the MMF channel and ensure modal noise is properly accounted for in the LRM draft spec
Assess modal noise penalty for different laser types
Timeline - input to September interim meeting@L,-l6.@L,-l6.PO)Mechanisms leading to channel variability** 3Connector offset:
connector offset may be a gearing factor for temporal effects through mode selective loss and mode coupling
static offset 3.5um average, 1.8um standard deviation for 50 micron fibre (i.e. 95% less than 7um); scaling for 62.5 micron fibre ?
Fibre perturbation:
Fibre shaker (TIA/E!A-455-203) may be necessary part of task 2 measurements, may not be sufficient
May require a range of frequency and amplitude - 'perturbation mask'
large amplitude at low frequency, small amplitude at high frequency
Laser wavelength
Rapid changes in laser wavelength result in modal noise; variance can be estimated using previous modal noise work
Temperature
Evolution of channel characteristics as link and laser source temperature vary can be modeled
How fast and by how much does each vary in a realistic link ?ZlZZZZDZZsZZ_Z>ZlDs_>P3Tasks Real environments
What's already out there describing in-building environments ? existing standards ?
Measurements of spectrum of time variation effects - volunteers tbd
Mechanisms: determine mechanical vibration rates and amplitudes for each mechanism
Experiment: relationship of perturbation spectrum to modal noise spectrum for each mechanism
Modeling:
Generate delay vs mode sets, and impulse responses for quasi-continuous perturbation mechanisms, for selected launches, over Cambridge fibre set and 'standard link'
Effect of temperature (link and source) over 'standard link'
Modal noise: penalty for different laser types over 'standard link'
'Standard link' for modeling and experiment:" Z" Z" Z" Zq" Z
G
S8,>v Progress
eVolunteers actively working each task !
To date:
Identified existing standards describing in-building environments
GR-63-CORE -
describes office environment vibration tests at 'constant acceleration' (0.1G & 1G) from 5-100 Hz
(vibration amplitude ~ 1/f2 )
IEC 61300-2-1
max frequency 55Hz
'Standard link' for modeling and experiments is in progress
Includes polarization controller and fibre shaker
up to 3 connectors with worst case offset consistent with preceding standards and existing link specs
Proposed measurement technique to determine relationship of perturbation spectrum to modal noise spectrumV1!ZC" Z Z Z Z Z< Z Z Zj Z1C{J(J(<j $
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connector offset may be a gearing factor for temporal effects through mode selective loss and mode coupling
static offset 3.5um average, 1.8um standard deviation for 50 micron fibre (i.e. 95% less than 7um); scaling for 62.5 micron fibre ?
Fibre perturbation:
Fibre shaker (TIA/E!A-455-203) may be necessary part of task 2 measurements, may not be sufficient
May require a range of frequency and amplitude - 'perturbation mask'
large amplitude at low frequency, small amplitude at high frequency
Laser wavelength
Rapid changes in laser wavelength result in modal noise; variance can be estimated using previous modal noise work
Temperature
Evolution of channel characteristics as link and laser source temperature vary can be modeled
How fast and by how much does each vary in a realistic link ?ZlZZZZDZZsZZ_Z>ZlDs_>P3Tasks Real environments
What's already out there describing in-building environments ? existing standards ?
Measurements of spectrum of time variation effects - volunteers tbd
Mechanisms: determine mechanical vibration rates and amplitudes for each mechanism
Experiment: relationship of perturbation spectrum to modal noise spectrum for each mechanism
Modeling:
Generate delay vs mode sets, and impulse responses for quasi-continuous perturbation mechanisms, for selected launches, over 'standard link'
Effect of temperature (link and source) over 'standard link'
Modal noise: penalty for different laser types over 'standard link'
'Standard link' for modeling and experiment:" Z" Z" Z" Zq" Z
G
S8,,, Progress
eVolunteers actively working each task !
To date:
Identified existing standards describing in-building environments
GR-63-CORE -
describes office environment vibration tests at 'constant acceleration' (0.1G & 1G) from 5-100 Hz
(vibration amplitude ~ 1/f2 )
IEC 61300-2-1
max frequency 55Hz
'Standard link' for modeling and experiments is in progress
Includes polarization controller and fibre shaker
up to 3 connectors with worst case offset consistent with preceding standards and existing link specs
Proposed measurement technique to determine relationship of perturbation spectrum to modal noise spectrumV1!ZC" Z Z Z Z Z< Z Z Zj Z1C{J(J(<j p p(
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