Electrical Dispersion Compensation (EDC)

Transcription

1 Electrical Dispersion Compensation (EDC) Liz Wu Linus Chuang For EE233 Spring 2006

2 EDC technology Biggest Challenge for 10G -- dispersion management 2.48G Long distance Long distance 10G ISI (Intersymbol interference) EDC -- compensates for optical dispersion in the electrical domain by algorithmic methods

3 EDC addresses three type of Dispersion Chromatic dispersion polarization dispersion T = DL λ d 1 2πC D = ( ) = β 2 2 dλ V λ g Modal dispersion P. Kirkpatrick et al. Intel Technology Journal 8, 83 (2004)

4 Brief Review of Dispersion

5 Existing Solutions of Dispersion Type Chromatic dispersion Modal dispersion Polarization dispersion Solution Dispersion compensate fiber Dispersive filter Fiber Bragg grating Graded fibers PMD compensator 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

6 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 psec/nm -chromatic dispersion -near ratification Short link-1gb Ethernet EDC standard -IEEE aq (10G-BASE) -10G over OM1 MMF network for 220m -modal dispersion -achieves ratification at mid 2006

7 10G with/without EDC 10 GbE shortreach 10 GbE shortreach 10 Git/s SONET 10 Gbps SONET with EDC long-haul long-haul with EDC Standard 802.3ae 802.3aq G ITU-TSG15 Max distance 26m 220m 80km 145km dispersion N/A N/A 1600ps/nm 2400ps/nm wavelength 850nm 1300nm 1550nm 1550nm fiber type MMF MMF SMF SMF 62.5/125um 62.5/125um 9um 9um BER 1E-12 1E-12 1E-12 1E-12 path penalty N/A N/A 2dB 2dB M. Furlong et al. EDN.com, 85 (March 30, 2006)

8 EDC equalization algorithms 1. CTF continuous-time filters -simplest, lowest power consumption -compensate for chromatic dispersion 2.FFE feedforward-equalizer DFE decision-feedback-equalizer -compensate for ISI that exceed one UI -most common EDC implementation 3. MLSE maximum-likelihood-sequence-estimator -best performance -but complicated and large power consumption

9 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

10 Market

11 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)

12 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

13 Market Forecast Short 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 EDC shipment forcast *Source: OFS (JEG) Estimate Based on CIR 12/04 PR for report titled 10- GIGABIT NETWORKING: A MARKET AND TECHNOLOGY ASSESSMENT

14 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.

15 Products of EDC Broadcomm announced EDC product BCM8105 at July Applied Micro Circuits Corp launched s19233 Feb Intersymbol Communications, a start up company focus on MLSE development for smartcdr Quake Technologies QT1006B1

16 EDC standards Long-haul ITU-TSG15 OIF(Optical Internetworking Forum) ITU(International Telecommunications Union) 10G OC-192 over OC-48 network for 145-km Address dispersion of 2400 pse/nm (today, OC G over SMF 80km ) Short-reach applications 802.3aq IEEE ITU(International Telecommunications Union) 10G link over OM1 MMF network to 220m Less complicated module than LX4 (today, Ethernet links over legacy OM1 MMF 26m)

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32 G. S. Kanter et al. Optics Express 11, 2019 (2003)

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34 Thank you