Re: [8023-10GEPON] Revised 10G budget
Dear Frank,
Thank you for the modification.
On the whole, it seems very sensible proposal except for some
items such as FEC selection etc.
Some questions on the PR20-D;
Could you explain why you've widened the launch power range from
3dB to 4dB only for PR20-D?
I just guess the reason like the following assumption.
- Margin
If we assume a cooled EML, 3dB would be safe enough.
Or maybe is it a margin for additional SOA variation?
- uncooled EML
Since EML+AMP is supposed to be the PR20-D basic transmitter,
EDFA output stabilization feedback can be utilized to reduce
variation range.
It is not clear whether 4dB range is sufficient or not for
an uncooled-EML with SOA. And I am not sure the combination
of cooled SOA and uncooled EML makes sense.
Having 4dB range will be more comfortable but if there's no
special intention for that, 3dB range in line with other classes
may make sense.
Best regards,
Motoyuki Takizawa
On Mon, 8 Oct 2007 16:47:43 -0400
Frank Effenberger <feffenberger@HUAWEI.COM> wrote:
> Dear All,
>
>
>
> I have taken some of the comments I received on my last Email, and modified
> the slides to come to the attached version.
>
>
>
> What I~{!/~}ve done is:
>
> 1. Reduce the PR10 OLT downstream transmitter Max and Min by 1 dB.
> (This reverts to the values presented in Takizawa~{!/~}s slides in September)
> 2. Reduce the PR10 ONU Rx overload number by 1 dB. (Following the Tx
> change)
> 3. Increate the PR20 OLT max power by 1 dB (Makes the Tx range 4 dB,
> which is more comfortable)
> 4. Increase the PR20 ONU Rx overload number by 1 dB. (Following the Tx
> change)
>
>
>
> Taken together, these changes then make the PR10 and PR20 ONUs identical in
> every respect. One less PMD!
>
> This is re-capped on the last slide.
>
>
>
> Sincerely,
>
> Dr. Frank J. Effenberger ~{8%@<?K~} ~{0#7R2)8q~}
>
> Huawei Technologies USA
>
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