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									                   Wavelength Plan Proposal
                    - Intermediate Report -


                                                           ver. 1.1




Intermediate report on wavelength plan proposal (May 2, 2007)         1
                                       Report at March meeting

   Conclusion in March meeting presentation

    By reviewing the proposals in IEEE meetings and systematically narrowing the 10GE-
    PON system configuration achieving coexistence with current systems, we found that
     - US : TDM-based overlay is preferable
     - DS : WDM-based overly using L-band is only one solution.


   Wavelength allocation

                            WDM filter problem of US/DS separation                   Candidate for 10GE-PON : L-band

                                       GE-PON (US)                         GE-PON (DS)       Video                        OTDR
     SMF cut-off problem




                     1.21       1.26        1.31       1.36        1.41     1.46      1.51       1.56    1.61      1.66          l

                                                                Additional filters may be required to 1G-ONU and V-ONU.
   Action Item

         Wavelength Plan Proposal


Intermediate report on wavelength plan proposal (May 2, 2007)                                                                        2
                      Configuration of optical filters in ONUs (1)

 Several types of optical filter configuration in ONUs are considered for coexistence, and
 in general these are mainly categorized into the following two cases:
   (Case-1) combination of several WDM filters, as shown in 3av_0703_hajduczenia_2.pdf,
   (Case-2) combination of WDM filters and optical bandpass filters.

                               (Case-1)                                                        (Case-2)
                                SWPF1           SWPF2                                        SWPF
                LD                                                              LD


                                         LWPF                                                         BPF
                                                                 1260~1360 1G/10G Up
                                                                 1480~1500 1G Down
                                                                 1550~1560 Video
                                  PD                             1574~1580 10G Down              PD
                                                                 1625~1650 OTDR



                  Pass l band      Min. guard band     Filter angle                  Pass l band   Min. guard band   Filter angle
  Filter name                                                          Filter name
                     [nm]                [nm]              [deg]                        [nm]             [nm]            [deg]

   SWPF1              -1360              120                45           SWPF          -1360              120            45

   SWPF2              -1580               45                0             BPF        1574-1580            14              0

    LWPF              1574-               14                0

Intermediate report on wavelength plan proposal (May 2, 2007)                                                                       3
                      Configuration of optical filters in ONUs (2)
                             (Case-1)                                                     (Case-2)

      Receiver side                                                    Receiver side
                                                Pass band                                                   Pass band

                                               10G-PON                                                       10G-PON
  1G&10G-PON (US)          GE-PON         Video (DS)        SWPF-1   1G&10G-PON (US)      GE-PON        Video (DS)
                           (DS)                                                           (DS)                     BPF

                                                          LWPF-1
   1.26           1.36    1.48 1.50       1.55 1.56             l    1.26         1.36    1.48 1.50     1.55 1.56       l
                     SWPF-1                                                          SWPF-1

      Transmitter side                                                 Transmitter side

       Pass band                 SWPF-1                                  Pass band             SWPF-1
                                               10G-PON                                                        10G-PON
  1G&10G-PON (US)          GE-PON         Video (DS)        SWPF-1   1G&10G-PON (US)      GE-PON        Video   (DS)
                           (DS)                                                           (DS)


   1.26           1.36       1.48 1.50    1.55 1.56             l    1.26         1.36      1.48 1.50   1.55 1.56       l


 The cost of the ONU would be mainly dominated by the optical transceiver components,
 and therefore the insertion loss property should be the most important factor in designing
 the filter to alleviate the optical transceiver specifications.
 From this perspective, first, the feasibility of the case-2 filter was considered because the
 smaller number of filters is preferable in terms of the insertion loss.

Intermediate report on wavelength plan proposal (May 2, 2007)                                                               4
                                             BPF specification (1)

        In studying the feasibility of the case2-type ONU blocking filters, we assumed
        the following conditions:
             (a) No additional filter to already deployed 1G-ONU and V-ONU,
             (b) Insertion loss : < 1dB,
             (c) Isolation@1560nm : > 35 dB,
             (d) No restriction on the module type,
             (e) ONU embedded filter (preferable).


                                                  Isolation: 35dB   Signal band:
                                         Video



                                                                              10G-PON
                                                                              (DS)
                                                                                     l
                                    1550 1560
                                                       What is required guard band?


        On the above conditions, system vendors investigated the required guard band for
        blocking video signal.

Intermediate report on wavelength plan proposal (May 2, 2007)                              5
                                             BPF specification (2)
  Shortest wavelength of 10G DS band and required guard band
    Study results on the required guard band (GB) are reported from system vendors;
      35dB-Isolation and 40nm-GB would be necessary for PLC-type module.
      15~20nm-GB would be feasible for BIDI-type module. (There is a report that 5nm-GB
       would be theoretically feasible.)
      For BOSA-type module, the insertion loss would be less than 1dB when the signal
       wavelength is assigned between 1574 and 1580nm.
      20nm-GB is now available for TO-CAN module.

                   It is considered that 16nm-GB, the shortest l of 1574nm, would be possible.

  Longest wavelength of 10G DS band
    The longest wavelength is referred to ITU-T recommendations such as G.982 and 983,
    in which the signal wavelength range shall be less than 1580nm.

                                            Isolation: 35dB             Signal band : 6nm
                                   Video


                                                                      10G-PON
                                                                      (DS)   l
                               1550 1560                    1574   1580
                                              Guard band : 16nm
Intermediate report on wavelength plan proposal (May 2, 2007)                                    6
                                                          Summary

  Configuration of optical filters in ONUs                              : WDM filter + BPF

                                                                        10G-PON
                                                                          (DS)
          1G&10G-PON (US)                  GE-PON               Video
                                           (DS)
                                                                                     Bandpass filter for extracting
                                                                                     only downstream signal


        1.26                   1.36          1.48 1.50          1.55 1.56           l

                      WDM filter for splitting and combining up- and downstream signals


  Wavelength allocation and BPF specification

                  Isolation:          Signal band:                              The shortest wavelength is bound by
                    35dB                  6nm                                   the characteristics of the optical BFP.
      Video
                                                                                The longest wavelength is bound by
                                                                                conventional ITU-T recommendations
                                                    10G-PON                     such as G.982 and 983, in which the
                                                    (DS)                        signal wavelength range shall be less
  1550 1560              1574                  1580                         l   than 1580nm.
          Guard band: 16nm
Intermediate report on wavelength plan proposal (May 2, 2007)                                                             7

								
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