25G/50G/100G EPON wavelength plan C...Sept. 2016 2 3 Only 25G in O-band: Plan C...

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1 25G/50G/100G EPON wavelength plan C Ed Harstead, member Fixed Networks CTO Dora van Veen, Vincent Houtsma, Bell Labs Supporters: John Johnson, Broadcom Sept. 2016

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    25G/50G/100G EPON wavelength plan C

    Ed Harstead, member Fixed Networks CTO Dora van Veen, Vincent Houtsma, Bell Labs

    Supporters:

    John Johnson, Broadcom

    Sept. 2016

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    Only 25G in O-band: Plan C

    kramer_3ca_5_0716.pdf

    http://www.ieee802.org/3/ca/public/meeting_archive/2016/07/kramer_3ca_5_0716.pdf

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    25G EPON TRx λ0

    WM

    Simple diplexer

    ODN

    S/C/L band

    O band 25G ONU

    50G/100G ONU

    25G OLT TRx λ2

    25G OLT TRx λ3

    25G OLT TRx λ4

    25G OLT TRx λ1

    Plan C: high level optical architecture. Focus on 1+4

    Step 1: what wavelengths in the S/C/L band for λ1, λ2, λ3, λ4? Step 2: what wavelengths in the O-band for λ0?

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    λ1 - λ4 in the S/C/L band: dispersion tolerance

    0

    50

    100

    150

    200

    250

    300

    1460 1510 1560 1610

    Dis

    pe

    rsio

    n (

    ps/

    nm

    )

    G.652 spectrum (nm)

    Fiber dispersion and dispersion tolerance25 Gb/s, 10 km, 1 dB penalty

    w/o dispersion compensation

    Fiber dispersion, max abs val

    duobinary tolerance, EML

    NRZ tolerance, EML

    Must design for worst case: NRZ detection

    No dispersion compensation required for NRZ detection up to 10 km for wavelengths up to ~1560 nm

    • 25G dispersion tolerance values based on simulations.

    • Experimental data is welcome.

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    Cost-optimized 100G EPON will require an optical pre-amp in the OLT to avoid optical post-amps in the ONU

    • EDFAs have lower noise figure than SOAs.

    • An EDFA preamp *might* be required to avoid post-amps in 100G ONUs, for PR30

    – There are EDFAs that support burst mode

    • The need for EDFA might be even stronger for PR40

    • EDFA is not an option if 100G wavelengths are in the O-band (Plans A, B, D, E)

    100G OLT

    λ1 Rx

    λ2 Rx

    λ3 Rx

    λ4 Rx

    λ1 Tx

    λ2 Tx

    λ3 Tx

    λ4 Tx

    λ d

    em

    ux

    m

    ux

    Diplexer

    -24 dBm

    -26.5 dBm

    R

    OA

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    Choosing wavelengths for λ1 - λ4

    No dispersion compensation required for

    ≤10 km

    EDFA

    1510 1520 1530 1540 1550 1560 1570 1580 1590 1600 1610 1620 1460 1470 1480 1490 1500

    S-band C-band L-band

    NG-PON2 US ITU-T

    RF

    1524-1560 nm Put US λs here

    Sweet spot

    10G EPON DS

    short end of 10G EPON ONU filter guard band

    No co-existence requirements

    GPON/ GE-EPON DS

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    Wavelength plan for λ1 - λ4. Assume 800 GHz CS

    Sweet spot

    Pure 100G EPON deployments can take advantage of lower fiber loss at these wavelengths

    1510 1520 1530 1540 1550 1560 1570 1580 1590 1600 1610 1620 1460 1470 1480 1490 1500

    Can maximize DS/US distance for lowest cost filtering

    All 800 GHz CS, conforming to industry norm Should be no wavelength drift issue

    upstream downstream

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    Choosing wavelengths for λ0

    1310 1320 1330 1340 1350 1360 nm 1260 1270 1280 1290 1300

    Plan C2 down up

    Plan C4 down up

    up Plan C1 down

    TDM co-existence with 10G EPON

    WDM co-existence with 10G EPON

    Plan C5 down up

    Plan C allows for increased flexibility to optimize 25G EPON

    – Cost-optimization

    – TDM or WDM co-existence with 10G EPON

    – Co-existence with gen 1 PONs

    The only option for Plan B

    Low downstream DML TDP

    uncooled DML in ONU

    up Plan C3 down EPON US (DFB); GPON 25G co-existence with GE EPON (DFB) and GPON*

    OLT DML still an option?

    *may support CTC objective: “Promote IEEE and ITU-T coordination” including “Shared Unified wavelength plan” zhang_3ca_1b_0716.pdf

    http://www.ieee802.org/3/ca/public/meeting_archive/2016/07/zhang_3ca_1b_0716.pdf

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    Dispersion compensation

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    If >10 km PONs must be supported, DCF can be deployed in 1+4 (not in 1+3 if DS/US λ0 is in the O-band)

    Should be able to support any differential distance.

    Characteristics

    – Optical loss: e.g. spec: 1.2 dB (10 km)

    – Size: e.g. module 9.2”x9.6”x0.75”

    – Cost: low, relative to the cost of the 100G OLT transceiver

    Dispersion compensation fiber (DCF) for PONs > 10 km

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    DCF deployment

    50G/100G TxR 50G/100G

    ONU

    50G/100G TxR 50G/100G

    ONU

    50G/100G TxR 50G/100G

    ONU DCF

    OLT

    0 km 10 km

    PONs ≤10 km don’t require DCFs

    • A DCF is installed at the OLT only for PONs >10 km

    • The cost and space impact of DCFs is proportional to the % of PONs of >10 km reach. For most (all?) operators this will be small.

    • Or, just create a 10 km spec and make the issue go away (e.g. miguelez_3ca_1a_0516.pdf)

    http://www.ieee802.org/3/ca/public/meeting_archive/2016/05/miguelez_3ca_1a_0516.pdf

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    Power budget

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    Optical assumptions

    • 100G mux and demux nominally add ~2.5 dB insertion loss each.

    • Cost-optimized 100G EPON puts all optical amplification in the OLT

    • Downstream TDP = 1.5 dB, upstream TDP = 3 dB (same as 10G EPON, but to be confirmed)

    • PR30 loss budget

    • There will be 1 dB FEC coding improvement in downstream relative to 10G EPON (to be confirmed)

    • 1 dB improvement in PR30 APD receiver performance vs. 10G EPON + 5 dB penalty for 25G (per NeoPhotonics yield analysis, in harstead_3ca_1a_0516.pdf.)

    • Launch power values from harstead_3ca_2a_0716.pdf

    AVPmin (dBm) ER (dB)

    EML 5 8

    cooled DML 8 6

    http://www.ieee802.org/3/ca/public/meeting_archive/2016/05/harstead_3ca_1a_0516.pdfhttp://www.ieee802.org/3/ca/public/meeting_archive/2016/07/harstead_3ca_2a_0716.pdf

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    Downstream optical levels (per harstead_3ca_1_0916).

    25G λ1 Tx ODN 25G λ1 Rx

    25G ONU

    100G OLT

    S R

    λ1 Rx

    λ2 Rx

    λ3 Rx

    λ4 Rx

    λ1 Tx

    λ2 Tx

    λ3 Tx

    λ4 Tx

    λ d

    em

    ux

    m

    ux

    Diplexer

    λ1 Rx

    λ2 Rx

    λ3 Rx

    λ4 Rx

    λ1 Tx

    λ2 Tx

    λ3 Tx

    λ4 Tx

    λ d

    em

    ux

    m

    ux

    Diplexer ODN

    25G OLT

    100G ONU

    -24.5 dBm +5 dBm

    -24.5 dBm

    -22 dBm +7.5 dBm

    Assume EMLs

    S R SOA Common OA post amp shown. Per channel OAs can also be considered.

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    Upstream optical levels (per harstead_3ca_1_0916).

    25G λ1 Rx ODN 25G λ1 Tx

    25G ONU

    100G OLT

    R S

    λ1 Rx

    λ2 Rx

    λ3 Rx

    λ4 Rx

    λ1 Tx

    λ2 Tx

    λ3 Tx

    λ4 Tx

    λ d

    em

    ux

    m

    ux

    Diplexer

    λ1 Rx

    λ2 Rx

    λ3 Rx

    λ4 Rx

    λ1 Tx

    λ2 Tx

    λ3 Tx

    λ4 Tx

    λ d

    em

    ux

    m

    ux

    Diplexer ODN

    25G OLT

    100G ONU

    -24 dBm

    Assume DMLs

    +8 dBm

    -24 dBm +8 dBm

    +5.5 dBm -26.5 dBm

    R S

    OA

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    25 Gb/s dispersion tolerance (simulated)

    Noise contributions, laser linewidth

    and non-linearities were not taken into

    account in the simulation.

    Duobinary:

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    10G PON ONU blocking filter

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    If GE-EPON and GPON co-existence were required for 100G EPON

    1450(I) 1441(I)

    (I) = Informative

    1415/1400(I) 1530 1539 1580-1625

    22 (I)

    7 (I)

    ONU tolerance to interferers would constrain NG-EPON downstream wavelengths to ≥ 1539 nm.