Upload
phungnguyet
View
237
Download
0
Embed Size (px)
Citation preview
www.huawei.com
Security Level:
HUAWEI TECHNOLOGIES CO., LTD.
100G EPON Coexistence
discussion
Dekun Liu
July, 2016
HUAWEI TECHNOLOGIES CO., LTD. 2
Background
What method of coexistence is used for 10GEPON is an important factor
for the decision of wavelength plan.
3 channels of 100G EPON will certainly coexist with 10G EPON by WDM.
The only decision is how 25G coexists with 10G.
Considering both symmetric and asymmetric, there are at least 3 possible
coexistence options:
Option 1: 25/25, 25/10, & 10/10 use a same upstream wavelength, TDM
coexistence
Option 2: 25/25 & 25/10 use a same upstream wavelength, WDM coexistence
with 10/10
Option 3: 25/10 & 10/10 use a same upstream wavelength, TDM coexistence,
25/25 uses another upstream wavelength, WDM with 10/10G
HUAWEI TECHNOLOGIES CO., LTD. 3
Option 1: TDM coexistent
25G DS
10G/25G
Dual Rx
25/25G US
25/10G US
1270+/-10nm
10G EML Tx
25G b/s Tx
25/10 G
Dual rate Rx
25G OLT 100G OLT
25/10G
Dual Rx1
25G Rx2
25G Rx3
25G Rx4
25G Tx1
25G Tx2
25G Tx3
25G Tx4
10G Tx1
25/25, 25/10 & 10/10G all coexist by TDM.
Main concern:
Low upstream bandwidth efficiency, DBA is complicated.
10G optics are re-done in 25G and 100G, this make the 25G and 100G OLT optics
quite complex
λ
HUAWEI TECHNOLOGIES CO., LTD. 4
Option 2: WDM coexistent
25G DS 25/25G US
25/10G US
1270+/-10nm
100G PON (including 25G) coexists with 10G PON by WDM
100G PON and 10G PON are two independent systems, upgrade simplicity
Main concern:
25/10G needs a new type 10G upstream transmitter, can’t re-use the existing
1270nm transmitter in 10G PON.
10G US Splitter 100G
EPON
10G EPON
OLT
10 G
25/10G
100 G
25/25G
100G ONU
10G ONU
λ
HUAWEI TECHNOLOGIES CO., LTD. 5
Option 3: TDM & WDM hybrid coexistent
100G and 25G symmetric system coexists with 10G by WDM
25/10G coexists with 10G PON by TDM
25/25 and 25/10G coexists by TDM? Or WDM?
25G DS 25/25G US 25/10G US
λ
25/25G-EPON
1270+/-10nm
25/10G-EPON DS is shared!
1270+/-10nm
HUAWEI TECHNOLOGIES CO., LTD. 6
Option 3: 2 type ONUs coexistent
25/25G & 10/10G WDM
25 G TRX
10G TRx 10/10 G
25/25G
1270nm
1290nm
25/10G & 10/10G TDM
25 G TX
10G Rx 10/10 G
25/10G
1270nm
1270nm
10 G TX
25/25G & 25/10G WDM
25 G TX
10G Rx 25/25 G
25/10G
1290nm
1270nm
25 G RX
25/25G & 25/10G TDM
25 G TX
25/10G
Dual Rx 25/25 G
25/10G
1290nm
1270nm
HUAWEI TECHNOLOGIES CO., LTD. 7
Option 3: 3 type ONUs coexistent
25/25G, 25/10G & 10/10G WDM
25 G TX
10G Rx
25/25 G
25/10G
25 G RX
10/10 G
10 G TX
25 G TX
25/25 G
25/10G
10/10 G
10 G TX
25/25G, 25/10G & 10/10G TDM
25/10G
Dual Rx
Quadr-plexer OLT module
Triplexer OLT dual rate module
OLT architecture depends on coexistence scenario
Complex optics in OLT are required for 3 type ONU coexistence, as DBA can’t go across
OLT boards.
HUAWEI TECHNOLOGIES CO., LTD. 8
Discussion
If we want to re-use existing 1270nm 10G optics for 25/10G, then TDM and complex
100G EPON OLT optics seem to be indispensable.
If we want to uncouple “100G EPON” & “10G EPON”, WDM coexistence, option 2 is the
best choice, then we need to re-consider the following motion.
HUAWEI TECHNOLOGIES CO., LTD. 9
Discussion
From the upgrade simplicity and coexistent flexibility considerations, WDM coexistence
between 10G EPON and 100G EPON is a better choice:
Upstream bandwidth efficiency is higher
WDM coexistence can support more co-existence scenarios, as 100G EPON is
uncoupled from 10G EPON.
100G EPON OLT optics will be much simpler in WDM coexistence.
The cost of using another wavelength 10G transmitter other than 1270nm is not
substantial if it’s close in spectrum (such as in 1290nm or ~ 1300nm)
HUAWEI TECHNOLOGIES CO., LTD. 10
Straw poll:
I prefer 25G symmetric EPON coexist with 25G asymmetric
EPON by
1. TDM ?
2. WDM ?
HUAWEI TECHNOLOGIES CO., LTD. 11
Straw poll:
I prefer:
1. 25G symmetric/asymmetric EPON coexist with 10G EPON by TDM
?
2. 25G symmetric/asymmetric EPON coexist with 10G EPON by
WDM ?
3. 25G symmetric EPON coexists with 10G EPON by WDM, 25G
asymmetric EPON coexists with 10G EPON by TDM ?
Thank you www.huawei.com