Re: [8023-10GEPON] [POWER_BUDGET] Report of local discussion
Takizawa san,
The operating temperature range of the SOA also needs to be addressed, if
the SOA is applied for the industrial temperature application, either on the
ONU or OLT box. Most of the SOA is only specified working from -5ºC to +70ºC
or -20ºC to +70ºC (with temperature controller ??).
Best regards,
David
----- Original Message -----
From: "Haim Ben-Amram" <Haim_Ben-Amram@PMC-SIERRA.COM>
To: <STDS-802-3-10GEPON@LISTSERV.IEEE.ORG>
Sent: Thursday, February 22, 2007 2:46 AM
Subject: Re: [8023-10GEPON] [POWER_BUDGET] Report of local discussion
> Motoyuki-san,
>
> I think for 29dB CHIL we have to use APD at the ONU Receiver, APD cost is
a temporary issue, its matter of quantities. Even for today APD cost
decrease quite fast. Aside the high sensitivity we can achieve by using APD
(more than 6dB!), FEC coding gain will be more effective (more than 4dB).
>
> Haim.
>
> -----Original Message-----
> From: Motoyuki TAKIZAWA [mailto:mtaki@ACCESS.FUJITSU.COM]
> Sent: Thursday, February 22, 2007 9:47 AM
> To: STDS-802-3-10GEPON@LISTSERV.IEEE.ORG
> Subject: [8023-10GEPON] [POWER_BUDGET] Report of local discussion
>
> All,
>
> As I was assigned in the last telecon to form a group to work
> on a Tx and Rx characteristic table for the 29dB CHIL especially
> from the view point of system vendors, we had a discussion on it
> among some Japanese members.
> I don't submit the draft table to here now. We did have draft
> characteristic tables from some vendors but we ended up modifying
> them again considering the issues we came up with in the call.
>
> This is an intermediate report of our talk.
>
>
> <Date>
> Feb 20, 1:00PM-3:00PM JST
>
> <Participants>
> Tsutomu Tatsuta NTT
> Akihiro Otaka NTT
> Ken-ichi Suzuki NTT
> Tomoaki Masuta NEC
> Akio Tajima NEC
> Toshiaki Mukojima Oki
> Shinji Tsuji Sumitomo
> Hiroki Ikeda Hitachi
> Satoshi Shirai Mitsubishi
> Naoki Suzuki Mitsubishi
> Hiroshi Hamano Fujitsu Laboratory
> Tetsuya Yokomoto Fujitsu Access
> Motoyuki Takizawa Fujitsu Access
>
> <Assumption>
> The assumption of wavelengths were 1.31um for US and 1.57um for DS,
> following the solution 3 in the presentation below.
> http://www.ieee802.org/3/av/public/2007_01/3av_0701_tatsuta_1.pdf
>
> <Downstream>
> The main point was wheather applying PIN-PD or APD in the ONU.
> Needless to say, PIN should be better for the cost reason, however
> we need to take a risk applying 'high power' SOA at the OLT that
> has less maturity (reliability).
> One idea of judging this is if the ONUs should have the same
> architecture for each class(PX10, PX20, ClassB++) as same as 802.3ah
> standard. It will have an influence on cost and selection for pieces
> of components both on the OLT/ONU.
>
> <Upstream>
> "PD + Preamp -------- DFB(EML)" would be a preferable solution
> for many of us. But we need a narrow band filter between
> Preamp(SOA) and PD and it doesn't seem we can have 1G/10G
> coexistence at the moment for this reason because 1GEPON needs
> 100nm band around 1310nm.
> Possible solutions are:
> - Seeking possibility of increasing LD(DFB/EML) power
> - Considering another appropriate wavelength for US
> Another topic was the availability of uncooled laser @10G
> with broad range of temperature(-40 to +85 degrees C), which
> will be expected to use for PX10/PX20.
>
> <Action Item>
> - Revise the draft charasteristic table
> DS: PD vs APD, considering if all ONUs should have the
> same arthitecture for each class.
> US: Study two solutions in detail.
> - Study availability of uncooled 10G laser with broad temperature
> range(-40 to +85 degrees C).
>
>
> Next discussion will be held on 2/23 JST.
>
>
>
> [Clarification]
> This local talk is actually not a closed one but I think it is
> important to make a draft ASAP and that it is good to have a
> local discussion among Japanese System Vendors first like I
> was asked to in the last telecon, maybe for the reason of
> timezone, language, etc...
> I think I'll report back to the ad hoc here and we'll have a
> fruitful discussion.
>
>
> Best Regards,
> --
> Motoyuki Takizawa
> Fujitsu Access Ltd. R&D Center
>