Re: [8023-10GEPON] PIN-PD D/S power budget proposal
Dear Mr. Feng,
Thank you for your clarification.
May be you are talking about pros and cons list in the Geneva meeting.
Firstly, I would like to list them up to clarify discussion.
Remaining cons for the PIN are;
1. More costly solution (first costs).
2. Size of OLT too big, TX and control electronics, power dissipation.
3. Questions of booster SOA reliability and availability for high power.
4. Possible WDM crosstalk in OLT.
5. Concern over optical surge from EDFA.
6. Concern for SRS penalty on analog video between 10G DS and video.
7. High power handling concerns.
I think these items are actually already solved by proposals in 0707_suzuki_1.pdf
The answers for each item is;
1. This may be true for the forst cost, but big amount of benefits
at fully subscribed system is expected.
2. Small, low power dissipation and mature technology is introduced in P.6 of
3av_0707_suzuki_1.pdf.
3. This is also shown in P.6 of 3av_0707_suzuki_1.pdf
4. For this item, I cannot fully understand what it is really means.
Could you clarify this?
5. In P.9, he also mentioned that shut down control also suppress the optical surge.
6. Power penalty which is introduced from DC, we can say it negligible according
to the figure.2 in page 8. The CNR degredation which is introduced from AC,
there is inference according to 3av_0707_mao_1.pdf , but if we use FM modulation,
this problem is avoidable.
I would like to remind that we have basic question if we should disscuss this issue
in task force or not as our chair said.
7. As for high power concerns, we think this is eye safety issue, and they are
proposed in PINPDbudget_070830.
I think these are the answers for you. If you have any additional concerns,
please let me know.
Sincerely,
Yoshifumi Hotta
Hao Feng wrote:
> Hotta san
> I mean mostly the high launch power related issues when PIN is used in
> ONU. At end of budget meeting in SF, we re-listed the technical issues for
> both EDFA/PIN and EML/APD solutions. The APD solution left only one issue on
> cost for ONU. But PIN/EDFA solution has still several issues not to be
> clear. My point is we should move one solution forward, which solution has
> the less technical risk. The cost issue should be left for future. The cost
> problem may be solved when the volume to go up as GPON case. Certainly, if
> some evolution on "low cost Rx" happens in future, it could replace the
> higher cost part without any problems.
>
>
> Best regards
> Hao
>
>
>
> -----Original Message-----
> From: Yoshifumi Hotta [mailto:Hotta.Yoshifumi@eb.MitsubishiElectric.co.jp]
> Sent: Monday, September 03, 2007 12:49 AM
> To: Hao Feng
> Cc: STDS-802-3-10GEPON@listserv.ieee.org
> Subject: Re: [8023-10GEPON] PIN-PD D/S power budget proposal
>
> Dear Mr. Feng
>
> I'm sorry but I cannot fully understand what is your questions are.
> Basically, I think Suzuki and his supporters had answered each problem which
> is pointed out in the meeting. If you think there is " many remained
> thchnical concerns ", we are are very appreaciated to discuss in the next
> Seoul meeting.
>
> From our point of view, all technical concerns for PIN based ONU are solved
> by experimental data and technical study. Also, There is no doubt for cost
> advantage of PIN based ONU's.
>
> It seems for me some APD supporter are opposing PIN based ONU for reason
> that "PIN supporters proposal is doubtful". I think this kind of arguments
> takes us nowhere.
>
> Sencerely,
> --
> Yoshifumi Hotta
> Mitsubishi Electric R&D center
>
>> Hotta san
>> There are a lot of information in the attached material to have been
>> presented on SF conference (3av_0707_suzuki_1.pdf). The
>> 3av_0707_hamano_2.pdf has answered your concerns on SF conference,
>> such as high power EML issues. Could you focus on answering the many
>> remained technical concerns caused by high launch power? The
>> 3av_0707_hamano_2.pdf has answered all of questions about using APD
> solution.
>> Best regards
>> Hao Feng
>> Eudyna Devices USA
>>
>> -----Original Message-----
>> From: Yoshifumi Hotta
>> [mailto:Hotta.Yoshifumi@EB.MITSUBISHIELECTRIC.CO.JP]
>> Sent: Thursday, August 30, 2007 6:32 AM
>> To: STDS-802-3-10GEPON@listserv.ieee.org
>> Subject: [8023-10GEPON] PIN-PD D/S power budget proposal
>>
>> All,
>>
>> In the last meeting, Suzuki had presentaion for PIN@ONU.
>> In discussion, because OLT max launch power is such high as +13dBm, we
>> had some questions about eye-safety from the floor.
>>
>> In the attached presentation, we clarify safety requirements which we
>> should support, and propose new power budget. We believe this one
>> could support both eye-safety and B++ with PIN-PD in the downstream
> direction.
>> Having discussions on the reflector is appreciated, also if you would
>> like to support this presentation, please let me know.
>>
>> Sincerely,
>> --
>> Yoshifumi Hotta
>> Mitsubishi Electric R&D center
>