Burst-Mode Technologies for Ultra-High Bit Rate, Agile Photonic Networks

1
Burst-Mode Technologies for Ultra-High Bit
Rate, Agile Photonic Networks

• David V. Plant
• James McGill Professor
• Bell Canada/NSERC Industrial Research Chair
• Department of Electrical and Computer Engineering
• McGill University
• CMOS Emerging Technologies
• Vancouver
• Sept. 23, 2009
• Acknowledge B. Shastri, M. Zeng, and N. Zicha

2
Outline

• Overview of PONS
• 5/10 Gb/s Burst Mode Receiver
• 1.25 Gb/s Burst Mode Receiver Performance over a
  1300km link
• Conclusions

3
Outline

• Overview of PONS
• 5/10 Gb/s Burst Mode Receiver
• 1.25 Gb/s Burst Mode Receiver Performance over a
  1300km link
• Conclusions

4
Multiaccess Networks
Downstream TDM ? 1.55 ?m

t
PS/PC
OLT
ONT
CO

t
Upstream TDMA ? 1.3 ?m
5
Outline

• Overview of PONS
• 5/10 Gb/s Burst Mode Receiver
• 1.25 Gb/s Burst Mode Receiver Performance over a
  1300km link
• Conclusions

6
Burst-Mode Receivers at OLT
Amplitude variations, ?A
Phase variations, ?f
CDR clock phase self-adjusts until lock achieved
clock walk
7
Problem Statement

• Amplitude variations (?A) ? APD/TIA BM-LA
• Phase variations (??)
• Frequency variations (?f)
• Short packets ? amplitude, phase, and frequency
  recovery must be quick.

• BM-CDR CDR CPA

8
Bursty Upstream PON Traffic
0!

• Packet 1 (dummy) - force BM-CDR to lock to
  certain phase before packet 2 arrival.
• Measurements made on packet 2.
• Goal is to reduce preamble field so as to (1)
  decrease burst-mode sensitivity penalty, (2)
  increase information rate, (3) improve upstream
  PON efficiency.

9
Conventional SONET CDR

• PLR 10-6 ? BER 10-10
• Preamble bits gt 48
• Shows clock walk

CDR clock phase self-adjusts until lock achieved
clock walk
10
Burst-Mode CDR
2 CDR CPA
2 CDR
11
5 Gb/s Burst-Mode CDR

• SONET CDR Centellax Part TR1C1-A recovers
  clock/data supports 5 Gb/s data rate and 10 Gb/s
  sampling rate.
• CPA (byte syncs phase picker) detects packet
  delimiter and performs clock phase acquisition
  implemented on a field programmable gate array
  (FPGA) Xilinx Virtex IV.
• 116 deserializer (DES) Maxim-IC Part
  MAX3995 produces 625 Mb/s data/clock by
  dividing output of CDR for digital logic
  processing on FPGA.
• 18 double-data rate (DDR) DES further
  parallelizes the data/clock to 78.125 Mb/s to
  ensure proper synchronization and better
  stability of DCM.
• Digital-clock manager (DCM) provides multiple
  phases of source clock, and zero propagation
  delay with low clock skew between output clock
  signals distributed on FPGA.

12
Experimental Setup
13
PLR vs. Phase Steps
CDR
BMRx

• PLR 10-6 ? BER 10-10
• Preamble bits gt 48
• Shows clock walk

• PLR 10-6 ? BER 10-10
• Preamble bits 0!
• Shows phase-picking works using delimiter field

DVP
13
14
BER Measurements
15
PON Efficiency

• Eus efficiency of upstream traffic
• nONU number of ONUs in PON
• tgt guard time
• tpre preamble time
• TDBA bandwidth allocation cycle
• RTT round-trip time OLT/ONU
• Tdelay other factors
• GEPON (1.25 Gb/s) standard Eus 70 for nONU
  32, tgt 1024 ns, tpre 832
  ns, and TDBA 200 µs.

Ref Nishihara et. al., J. Lightw. Technol., vol.
26, no. 1, 2008.
16
Outline

• Overview of PONS
• 5/10 Gb/s Burst Mode Receiver
• 1.25 Gb/s Burst Mode Receiver Performance over a
  1300km link
• Conclusions

17
Experimental Setup
Montréal Québec City Montréal RISQ Network
18
Eye Diagrams
19
PLR vs. Phase Steps
CDR
BMRx

• PLR 10-6 ? BER 10-10
• Preamble bits gt 48
• Shows clock walk

• PLR 10-6 ? BER 10-10
• Preamble bits 0!
• Shows phase-picking works using delimiter field

20
Outline

• Overview of PONS
• 5/10 Gb/s Burst Mode Receiver
• 1.25 Gb/s Burst Mode Receiver Performance over a
  1300km link
• Conclusions

21
Conclusions

• Demonstrated a simple yet effective solution for
  acquiring phase.
• Solution demonstrated over 1300 km live link.
• Moving towards chip-level solution.

22
Extras
23
100 Gb/s is Next

• Drivers of 100 Gb/s
• New services such as IPTV and HD-TV, video on
  demand, interactive video gaming, education on
  demand, video conferencing, and video
  surveillance
• Voice requires 64 kb/s
• Video requires 100 Mb/s
• Increase in of
  research publications
• Several 100 G
  commercial field trials

24
Fiber Optic System Capacity
10-Tb/s Systems
Research Systems
Commercial Systems
Advanced Modulation Formats
Single Channel
DWDM
(Alcatel-Lucent)
25
BMRx with FEC
26
64/57 Hamming Decoder
27
Receiver Sensitivity

• Preamble penalty of 48 bits with CDR.
• Power penalty of 0.2dB with BM-CDR.
• Tradeoff!

28
PON Architecture Topology
P2P
P2MP
P2MP

• Active star
• Only a single feeder fiber is needed to carry all
  traffic to an active node
• Reduced costs
• Active node needs powering and maintenance

• Passive star (PON)
• Active node replaced by power splitter/combiner
• Reduced installations costs
• A completely passive nature of outside plant
• Avoids power and maintenance costs
• Well designed access techniques to avoid traffic
  collision

• Point-to-point
• Provides ultimate capacity and most flexibility
  to upgrade services for customers
• Many fibers from local exchange to homes
• Entails high first installation costs
• At local exchange, many fiber terminals as homes
• Floor space and power issues

29
PON Data Rate Scaling
30
What Will PONs Enable?

• Triple play services voice, video, high-speed
  data for fast Internet,
• HDTV, on-line gaming, fast P2P file transfer
• FTTH/P can solve problem of limited bandwidth to
  end-user last mile problem.

31
RISQ Network
Québec city
Montréal