1. Downstream Wavelength Range discussion review and Solution Proposal
Supporters:

2. Basic ideas
Japan public fiber network requires band shorter than 1580nm, due to use of OTDR; and use of PX30 optics, due to designed loss budget
PX30 must employ 1574 to 1580nm band
PX10 and PX20 classes could benefit from 20nm of pass band, since uncooled transmitters are a possibility for these classes
How to widen the band in a most compatible way?

3. Other concepts
It is good if our choice of band coincides with existing optical band plans
Most importantly, the CWDM bandplan
It is good (maybe) if the same receiver specification can operate over both transmitter specifications
The receiver band is the superset of all of the transmitter bands
We then have a ‘universal Rx’

4. Wavelength Plans Option A: 1574 to 1580nm (PX30 must use this band)
EPON
Tx & Rx
Video A
Option A: 1574 to 1580nm
(PX30 must use this band)
EPON
Tx & Rx
Video B
Option B: 1574 to 1594nm
(potential superset)
EPON
Tx & Rx
Video C
Option C: 1580 to 1600nm
(Alignment with CWDM)
EPON
Tx & Rx
Video D
Option D: 1574 to 1600nm
(Superset and CWDM!)
EPON
Tx & Rx
Video D
Option D: PX10-20 Tx
EPON
Tx & Rx
Video D
Option D: PX30 Tx

5. Proposal
Specify the downstream 10G EPON wavelength band to be 1574 to 1600 nm.
PX10 and PX20 Tx: 1580 to 1600nm
PX30 Tx: 1574 to 1580nm
All classes receivers: 1574 to 1600nm