Liz Wu - inst.eecs.berkeley.eduee233/sp06/student... · BER 1E-12 1E-12 1E-12 1E-12 62.5/125um...
Transcript of Liz Wu - inst.eecs.berkeley.eduee233/sp06/student... · BER 1E-12 1E-12 1E-12 1E-12 62.5/125um...
Electrical Dispersion Compensation (EDC)
Liz WuLinus Chuang
For EE233
Spring 2006
EDC technology
EDC -- compensates for optical dispersion in theelectrical domain by algorithmic methods
Biggest Challenge for 10G -- dispersion management
(Intersymbol interference)ISI
2.48G
10G
Long distance
Long distance
EDC addresses three type of Dispersion
22
2)1( βλπ
λ
λC
VddD
DLT
g
−==
∆=∆
Chromatic dispersion polarization dispersion
Modal dispersion
P. Kirkpatrick et al.Intel Technology Journal 8, 83 (2004)
Brief Review of Dispersion
Existing Solutions of Dispersion
Chromatic dispersion
Modal dispersion
Polarization dispersion
Dispersion compensate fiberDispersive filterFiber Bragg grating
Graded fibers
PMD compensator
Type Solution
Drawbacks – Needs to be engineered for each link-- varies with wavelength
EDC -- deal with the dispersion at the receiver end -- address three different dispersion by different algorithm
Cost-effective & Easy
10G solution on legacy fiber network
Long-haul -OC-48 (2.48G bps)EDC standard-ITU/OIF-ITU-TSG15-10G over OC-48 network for 145-km-2400 psec/nm-chromatic dispersion-near ratification
Short link-1Gb EthernetEDC standard-IEEE-802.3aq (10G-BASE)-10G over OM1 MMF network for 220m-modal dispersion-achieves ratification at mid 2006
10G with/without EDC
2dB2dBN/AN/Apath penalty
1E-121E-121E-121E-12BER
9um9um62.5/125um62.5/125um
SMFSMFMMFMMFfiber type
1550nm1550nm1300nm850nmwavelength
2400ps/nm1600ps/nmN/AN/Adispersion
145km80km220m26mMax distance
ITU-TSG15G.959.1802.3aq802.3aeStandard
long-haul with EDClong-haulwith EDC
10 Gbps SONET10 Git/s SONET10 GbE short-reach
10 GbE short-reach
M. Furlong et al.EDN.com, 85 (March 30, 2006)
EDC equalization algorithms
1. CTF – continuous-time filters
2.FFE– feedforward-equalizerDFE– decision-feedback-equalizer
3. MLSE – maximum-likelihood-sequence-estimator
-simplest, lowest power consumption-compensate for chromatic dispersion
-compensate for ISI that exceed one UI-most common EDC implementation
-best performance-but complicated and large power consumption
Dynamic EDC- self-adaptable algorism
• Fiber degrades over time and introduce new source of interference
• EDC refine compensation algorisms to adapt to these changes
• Close loop feedback mechanism to modify filters and gains
Market
Who entered the market?
Long-haul application- Broadcomm (BCM8105)- SCINTERA (SCN5028) - Civcom (module)- Kodeos Communications- Infinera........
~ US$ 500 per chip(less complicated)
Short link application- SCINTERA (SCN3142)- Vitesse- Infinera- PHYworks (PHY1060)- Intel (?)- Cisco (equipment)- Aeluros........
~US$100 per chip(more complicated)
Who is threatened by EDC?
Long-haul application- Fiber manufacturers- dispersion filter vendors
Short link application- Fiber manufacturers
(Laser optimized 50 µm fiber)- LX4 vendors
Market ForecastShort link application- $400M~$600M of total addressable market revenue opportunity is at
the stake- 1 million 10GbE optical ports to be shipped in 2009 worth $3B
Long-haul application- sub $200M market
0
200
400
600
800
1000(thousand)
2005 2006 2007 2008 2009 2010year
EDC shipment forcast
*Source: OFS (JEG) Estimate Based on CIR 12/04 PR for report titled 10-GIGABIT NETWORKING: A MARKET AND TECHNOLOGY ASSESSMENT
Market Impact
• ITU-TSG15 is nearing ratification• 830.aq is in draft status and it should achieve ratification
by midyear• Interoperability testing between Industry leaders• 40G• LX4• According to ElectroniCast, the worldwide consumption
value of filter-based devices providing variable chromatic dispersion compensation for high-speed telecommunication networks (>=10Gbps) is forecasted to increase from an estimated $580,000 in year 1999 to $30 million in year 2005.
Products of EDC
• Broadcomm announced EDC product BCM8105 at July 2005.
• Applied Micro Circuits Corp launched s19233 Feb. 2005
• Intersymbol Communications , a start up company focus on MLSE development for smartCDR
• Quake Technologies QT1006B1
EDC standardsLong-haulITU-TSG15OIF(Optical Internetworking Forum) ITU(International Telecommunications Union)10G OC-192 over OC-48 network for 145-kmAddress dispersion of 2400 pse/nm(today, OC-192 10G over SMF 80km )
Short-reach applications802.3aqIEEEITU(International Telecommunications Union)10G link over OM1 MMF network to 220mLess complicated module than LX4(today, Ethernet links over legacy OM1 MMF 26m)
G. S. Kanter et al.Optics Express 11, 2019 (2003)
Thank you