- . , . TWDM PON WDM- .
PON , — , . Next-gen PON .
PON — EPON- GPON-.
GPON- TWDM PON — Time Wavelength Division Multiplexing Passive Optical Networking, () .
TWDM-PON . upstream (λ1 — λ4), downstream (λ5 – λ8).
TWDM PON : 1270-1280/1570-1580 — XG-PON-, 1535-1540/1553-1558 — -band-, 1535-1540/1570-1580 — +L-band-.
TWDM PON -band +L-band
EDFA .
, up/downstream, TWDM PON (tunable Tx) (selective Rx) (OLT ONU/ONT).
, TWDM PON .
TWDM PON , , . 10G/10G 2.5G/2.5G, 10G/2.5G.
TWDM PON — XG-PON , -band +L-band .
1. XG-PON-. XG-PON: 1270-1280 upstream 1570-1580 downstream. : TWDM PON, GPON,
CATV.
EDFA, 33 .
XG-PON-
GPON+CATV .
2. -band-. -band-: 1535-1540 upstream 1553-1558 downstream. : TWDM PON, GPON, XG-PON.
-band- EDFA
DWDM- 1529-1561 .
EDFA 38 . , .
CATV.
3. +L-band-. Red- -minus Band 1535-1540 upstream L-minus Band 1570-1580 downstream. : TWDM PON, GPON, CATV.
38 PON CATV. TWDM PON +L-band- , L-band- downstream. EDFA L-band , -band .
GPON TWDM PON, GPON XG PON1, , TWDM :
. GPON 10 / downstream 2,5 / upstream, TWDM PON 10 /, — 40 /.
. GPON . , λ1±5 . , TWDM PON λ1±1,6 . , .
. GPON <30~33 TWDM PON, 38 .
TWDM PON, :
“pay-as-you-grow”. TWDM PON .
( ) , . « », , , .
TWDM PON “local-loop-unbundling” (LLU). PON- . LLU / , PON .
TWDM PON , , , . , . TWDM PON PON-, , . , GPON, – .