david lewis, john heaton, beck mason june 2012grouper.ieee.org/.../jul12/lewis_01a_0712_optx.pdf ·...
TRANSCRIPT
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David Lewis, John Heaton, Beck Mason
Next Generation 100G Optics Study Group
June 2012
PAM SMF Transmitter Testing
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Background
Experimental Setup and Previous Measured Results
Principal of Bandwidth Improvement
Signal Processing for PAM-8 to Reduce Rise / Fall Time
Future Work
Overview
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heaton_01_0312_ng100goptx presented the concept for digital linearization of a DAC to compensate for non-linearity in the electrical-to-optical conversion
lewis_01_0512_ng100goptx presented measured results showing 8 GBaud PAM-8 (24 Gbit/s) eye diagrams generated using an electroabsorption modulator and a 64 Gsample/s 8-Bit DAC
schell_01_0712_optx presented measured results showing up to 28 GBaud PAM-4 (56 Gbit/s) and PAM-8 (84 Gbit/s) eye diagrams generated using an electroabsorption modulator and a 3-Bit DAC
Background
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100G SMF PMD with PAM
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Experimental Setup
• DAC evaluation board from Fujitsu
• SMF is a short patch cord connecting the TOSA directly to the optical port of
the oscilloscope
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Electrical and Optical Eyes for Reference Data Set
Can we reduce the rise time by applying a
correction from the DAC ?
Need to emphasize the high frequency
components
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PAM DAC – Theory of RF Roll-Off Compensation
Ideal Spectrum Measured Spectrum
Inverse of Measured
Spectrum
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Original Data - Electrical
Estimated 10% to 90% rise time = 26.8 ps and fall time = 20.3 ps [ mean = 23.55 ps ]
Estimated 20% to 80% rise time = 18.2 ps and fall time = 12.4 ps [ mean = 15.30 ps ]
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PAM DAC Data – Eye Diagram to be Corrected
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PAM DAC Data – Ideal Compensating Waveform
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PAM DAC Data – Digital Data With DAC Limitations
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PAM DAC Data – Voltage Compensating Waveform
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PAM DAC Data – Voltage Compensated Signal
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Pre-Emphasised Data (1) - Electrical
Estimated 10% to 90% rise time = 19.7 ps and fall time = 18.3 ps [ mean = 19.00 ps ]
Estimated 20% to 80% rise time = 12.3 ps and fall time = 12.6 ps [ mean = 12.45 ps ]
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Pre-Emphasised Data (2) - Electrical
Estimated 10% to 90% rise time = 19.8 ps and fall time = 12.6 ps [ mean = 16.20 ps ]
Estimated 20% to 80% rise time = 12.7 ps and fall time = 8.4 ps [ mean = 10.55 ps ]
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Rise and Fall Time Comparison Table
20% to 80% 10% to 90%
Un-compensated
Data Set 15.30 ps 23.55 ps
Compensated
Data Set 1 12.45 ps 19.00 ps
Compensated
Data Set 2 10.55 ps 16.20 ps
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Pre-Emphasised and Level Adjusted Data - Electrical
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Theory of spectral shaping to compensate for frequency roll-off to increase the data rate of a PAM-8 Optical Transmitter
– Can compensate for the amplitude of the frequency response of the modulator as well as linear and (small) non-linear phase
– Can compensate for the overall frequency response of the link
• As long as the combined link roll-off is not too high around the third harmonic frequency of the bit pattern
The theory is applied to 8 Gbaud PAM-8 (24 Gbit/s) and 16 Gbaud PAM-8 (48 Gbit/s)
Measured results are shown for 8 GBaud PAM-8 electrical eyes where the average rise / fall time was reduced by 31%
Future work
– Demonstrate optical data rate improvement experimentally
– Demonstrate nonlinearity compensation
Summary
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Additional Slides – For Answers to Questions
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Electrical Eye Rise Time Measurements
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Electrical Eye Fall Time Measurements