TP2 and TP3 Parameter Measurement Test · PDF fileTP2 and TP3 Parameter Measurement Test...
Transcript of TP2 and TP3 Parameter Measurement Test · PDF fileTP2 and TP3 Parameter Measurement Test...
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110th Oct 2005
TP2 and TP3 Parameter Measurement Test Readiness
Jonathan King, Sudeep Bhoja, Jeff Rahn, Brian Taylor
10th Oct 2005
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210th Oct 2005
Contents
• Tx and Rx Specifications• TP2 Testing
– Tx: Eye Mask OMA, ER, Average Power Encircled Flux (and CPR) RIN (and measured SNR (Tx to Rx)) TWDP
• TP3 Testing – Stressed Eye Generator– Rx: B-B Sensitivity Performance
TP3 Test Waveforms Overload
Aim is to show experimental verification of test procedures & compliance to specifications
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310th Oct 2005
Summary of Major LRM Parameters at TP2 & TP3
>30% inside 5um radius>86% inside 11um radius
Encircled Flux4.7dBTWDP
5x10-5 hits in margin0%Eye Mask Margin-128dBmOMA/HzRIN+0.5dBmMean Power+1.5-4.5dBmTx OMA
CommentsMaxMinTP2 Parameter
TP3 informative waveform-6.5dBm OMAInformative Sensitivity TestTP3 normative waveforms+1.5
+0.5dBm OMAdBm mean
Overload
TP3 normative waveforms-6.5dBm OMAStressed Sensitivity Test+0.5-8.5dBmMean Power+1.5-6.5dBm OMARx OMA Range
CommentsMaxMinTP3 Parameter
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410th Oct 2005
TP2 TestingParameters measured at module level for TP2 Readiness evaluation: • Average launch power, OMA, ER, Jitter, Eye-mask Margin
– Test kit required:• 231 PRBS data source (eg XAUI, self generated), bit trigger• 8x1 8x0 (or similar) data source• Digital Oscilloscope with O-E• Optical power meter
• TWDP– Test kit required:
• 29 Data source, pattern trigger• Digital Oscilloscope with O-E• Computer
• Encircled Flux– Test kit required:
• IR camera or equivalent method
TP2 tests use conventional equipment and established methods
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510th Oct 2005
TP2 Measurement Results
• Typically >4 σ margin to spec • Confirms TP2 specifications are consistent with high volume
manufacture, as required for PAR
11.9-4.5 (min)0.27-1.27Min/coldSMF OMA12.30.25-1.48Nom/nom 7.90.37-1.6Max/hot
3.805.2820.0Min/coldEye Margin %4.14.9720.6Nom/nom NB: 0 hit limit used 4.04.6518.5Max/hot
5.0331.5225.4Nom/nom Jitter p-p, ps8.50.164.41Max/hot13.30.094.31Nom/nom
Min/cold
Max/hotNom/nom Min/cold
Supply,Temp
5.60.38-1.64
6.9
6.56.2
Margin to Spec. σ
3.5
0.5 (max)
Spec
ER, dB
SMF power, dBm
Parameter
0.164.62
0.29-1.350.26-1.12
σAverage
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610th Oct 2005
TP2 Encircled Flux and CPR Testing & Results
Encirc led flux
0102030405060708090
100
1 2 3 4 5 6 7 8 9
%
11um 5um
>30%, 5um
>86%,11um
4.4 σ
4.9 σ2.3 σ
Margin to spec
2dB
86%30%Spec
CPR **
11 um radius5um radiusEncircled Flux
0.25dB0.9dB
2.32%97.3%13.3%60.4%Sigma Average
Encircled Flux:• Non-IEC method used here (scanned SM fibre technique)• Comparison underway with IR camera approach
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710th Oct 2005
TP2 Measurements: RIN
• Test conditions– Nominal: 30oC, nominal module bias, & nominal back-reflection– Stressed: 70oC, low supply (-6%), and 12dB back-reflection
• Nominal Tx OMA -2dBm into SMF– Worst case RIN: -140dB/Hz nominal, -137dB/Hz stressed
-155
-150
-145
-140
-135
-130
-4 -3 -2 -1 0 1 2 3
Nominal RIN1 (dB/Hz)Nominal RIN0 (dB/Hz)Stressed RIN1 (dB/Hz)Stressed RIN0 (dB/Hz)
RIN
(dB
/Hz)
OMA (dBm)
RINdB/Hz
OMA into SMF
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810th Oct 2005
TP2 Measurements: Example of Tx-Rx SNR
• Test condition– TOSA & ROSA: 70oC, low
supply (-6%)• At -2dBm OMA Tx output
power– SNR > 38dBe at -6.5dBm
OMA Rx input
25
30
35
40
45
-14 -12 -10 -8 -6 -4 -2 0 2
-3.9dBm_SMF-3dBm_SMF-2dBm_SMF-1dBm_SMF0dBm_SMF
SNR
(dB
)
OMA (dBm)Received OMA, dBm
LRM spec30dBe
8dBe margin to spec
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910th Oct 2005
TP2: TWDP
• TWDP measurements here used Draft 2.2 stressors, 100/50 TFF/DFE EDC emulation– Normalization of captured waveform to OMA added within code
• 4.7dB test limit, as in Draft 2.2• Needs repeating with latest finite EDC emulation and latest OMA
extraction code
• 10 samples typically >4 σ margin to spec
Max/hotNom/nom Min/cold
Supply,Temp
3.9σ0.074.416.1σ
4.4σ
Margin to Spec.
4.7
Spec
TWDP, dB
Parameter
0.064.310.084.32
σAverage
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1010th Oct 2005
TP3 TestingParameters measured at module level for TP3 Readiness Evaluation: • Normative sensitivity tests
– Test kit required:• Stressed eye generator (SEG) with E-O (3.5dB ER, 27dB SNR)• BER detection• Optical power meter
• Overload – Test kit required:
• 29 Data source, pattern trigger• Digital Oscilloscope with O-E• Computer
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1110th Oct 2005
TP3 Testing: SEG (Stressed eye generator) for LRM
• Creates a stable, stressed channel that can be used to test and compare receiver performance
• ISI generator is based on TFF plus linear E-O– Avoids issues with long period reflections associated with lumped
element implementations• On board PRBS generation and error detection • Large number of taps permits better fits
– Short period reflections can be compensated for with extra taps– DUT sees accurate stressor
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1210th Oct 2005
SEG Block DiagramUSB interface
uC
XAUIbias
T TOSALinearDriverEDC
ExtData
source
ROSA
LAchoice of external
data source
electrical noise source
231-1 PRBS
• Like a transponder, but with EDC in Tx chain, linear driver & E-O• USB interface for easy PC based GUI control• Implements 802.3aq TP3 Test Waveforms; fiber pulse response
emulations are also possible.
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1310th Oct 2005
SEG Board Photo
PowerSupplies
USB
TOSAOutput
Bias Tee
Linear Driver
EDC
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1410th Oct 2005
SEG: Symmetric Channel
• Blue = SEG fit, Red = Target channel• PIE-D value 3.85 dB
– PIE-D error = +0.03dB• SNR = 30.46dBe
– SNR error = -0.54dBe• ER = 3.6dB
– ER error = +0.1dB• OMA = -3.0 dBm
temporal frequency
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1510th Oct 2005
SEG: Pre-cursor Channel
• Blue = SEG fit, Red = Target channel• PIE-D value 4.1 dB
– PIE-D error = +0.06dB• SNR = 30.65dBe
– SNR error = -0.35dBe• ER = 3.63dB
– ER error = +0.13dB• OMA = -2.96dBm
temporal frequency
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1610th Oct 2005
SEG: Post-cursor Channel
• Blue = SEG fit, Red = Target channel• PIE-D value 4.2 dB
– PIE-D error = 0.0dB• SNR = 31.66dBe
– SNR error = +0.66dBe• ER = 3.6dB
– ER error = +0.1dB• OMA = -2.99dBm
temporal frequency
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1710th Oct 2005
SEG Characteristics*
dH2
dH3
dB/Hz-128-135RINOMA
dBc [4]-<-40
dBc [4]-<-38Transmitter
Linearity
0.08
2e-4
-
16
3.7
-2.6
-1.5
Typ
MSE4e-4-Pulse Response Fit Error
dB0.175-0.175PIE-D Error
dBm0.5-4Average Power
dB-20-Optical Return Loss
Hz100Dynamic Repetition Rate
dB (optical) [3]1715Signal-to-Noise Ratio
dB [2]TBD3.5Extinction Ratio
dBm [2]TBD-4.5OMA
UnitMaxMinItem
[*] Measurements with 62.5µm MCP[2] Max upper bound is determined by linearity requirements.[3] Consistent with IEEE 802.3aq D2.2 [4] 500MHz tone
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1810th Oct 2005
SEG: Calibration
• Measure the step response of the channel using a 128 bit square wave
• Calculate the pulse response• Calculate PIE-D using the folded frequency method• Linearity is guaranteed by design bounds• Combination of SNR, ER, goodness of fit, and PIE-D value used to
determine suitability of channel for testing• Procedure iterates until the target SNR and ER are achieved• BER tested on reference RX
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1910th Oct 2005
Test results with SEG
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2010th Oct 2005
Transponder Measurements: 220m (Draft 2.2) Normative Tests
15 units tested over 3 corners: typically >4σ margin to spec
4.5 σ0.72-9.7Min/coldSymmetric4.5 σ0.79-10.1Nom/nom 4.6 σ0.83-10.3Max/hot
4.7 σ0.85-10.5Min/coldPre-cursor6.4 σ0.69-10.9Nom/nom 7.7 σ0.57-10.9Max/hot
Post-cursor
Stressor
8.3 σ0.55-11.1Max/hot7.9 σ0.58-11.2Nom/nom 6.3σ0.64-10.6Min/cold
Margin to spec(-6.5dBm)
σdB
Average sensitivitydBm OMA
Supply/temp.
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2110th Oct 2005
Rx Overload Measurements
• SEG overload test capability recently achieved, enabled with high power cooled DFB used as O-E– Max output +3dBm OMA max (2dBm mean, 6.4dB ER)
>2.6
>2.6
>2.6
Overload dBm OMA(Module)
Min/cold220m Symmetric
3.0Nom/nom
Max/hot
Min/cold220m Pre-cursor
3.6Nom/nom
Max/hot
220m Post-cursor
Stressor
Max/hot3.5Nom/nom
Min/cold
Overload dBm OMA(Engineering test bed)
Corner
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2210th Oct 2005
Summary
• Overview presented of the measurement capabilities & the technical feasibility for many of the 802.3aq 10GBASE-LRM TP2 and TP3 Parameters– Test capabilities for TP2 parameters established– Test capabilities for TP3 parameters established
• Excellent TP2 and TP3 performance and margins demonstrated– Essentially all measurements were completed at the TP2 & TP3 points
connected to implementations complying to different industry MSAmodules
• Supports the practicality and manufacturability of 10GBASE-LRM PMD for the TP2 and TP3 specifications