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Dear David, Thank you for your contribution and I am sorry for my late response. I think there is a conflict of views about the use of pre-amplifiers. So I would like to clarify that difference. I do not believe we need to use a narrow-band optical filter for 10G upstream signals, because the FEC can effectively compensate power penalty due to ASE noise. I believe we should avoid wide-gain-band (I think 20 or 30 nm is preferable.) for each signal because wide-gain-band increase ASE -ASE beat noise. So I think the problem is how to eliminate ASE noise for 1G-upstream signals because FEC is not mandatory and the use of a narrow-band optical filer is not practical due to its wide wavelength region. To make matters worse, ASE noise generates a noise floor in a 1G error rate curve in the wide-gain-band situation (Wide-gain-band will generate a significant noise floor.). I believe almost all the carriers require error free optical systems without a noise floor in error rate properties. So I think pre-amplifiers without optical filters or FECs are not acceptable. But I think the use of optical amplifier is possible in the dual rate situation. We can use an optically-paralleled configuration when we use a pre-amplifier. In this configuration, the use of an asymmetric (1:n) power splitter can achieve the same 1G power penalty as or less 1G power penalty than that of the electrically-paralleled configuration. Moreover, pre-amplifiers can compensate the splitter loss (1/(n+1)) and easily achieve the 10G sensitivity of -27 dBm or less. Best regards, Ken-ichi At 2007/05/10 17:55 David Piehler wrote: > All, Please see attached file which addresses issues raised in the email > and teleconference discussions. > > I will plan to present this material as well as experimental results at > the upcoming study group meeting in Geneva. > > Please let me know if there are other issues to be addressed. I look > forward to any comments. > > Thanks! > > David > > > David Piehler > Alphion > mobile: +1 732 692 4581 > > -----Original Message----- > From: Lingle, Jr, Robert (Robert) [mailto:rlingle@OFSOPTICS.COM] > Sent: Friday, February 23, 2007 5:12 PM > To: STDS-802-3-10GEPON@LISTSERV.IEEE.ORG > Subject: [8023-10GEPON] [POWER_BUDGET] SOA/PIN for 10G/1G OLT receiver > > All, > > The next call(s) will occur on Tuesday Feb 27 at 7PM EST and Wednesday > Feb > 28 at 9AM EST. > > Toll-free in US 866-263-8899 > Outside US 816-249-6061 > Conf. Code 7707985015 > > Robert > > Robert Lingle, Jr. > Fiber Design and Transmission Simulation OFS Corporate R&D, Atlanta > 404-886-3581 (cell) > 770-798-5015 (office) -- Ken-Ichi Suzuki NTT Access Network Service Systems Labs. E-mail:kenyichi@ansl.ntt.co.jp Tel:+81-43-211-3189/Fax:+81-43-211-8250
Optically_paralleled_configuration.ppt