tunable filter based optical add/drop technology (toadm) jay hsieh.pdf · tunable filter based...
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Optoplex Confidential 1
Tunable Filter based Optical Add/Drop Technology
(TOADM)Jay Hsieh, Optoplex Corporation
Fremont, CA
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Optoplex Confidential 2
Benefit of Tunability/Reconfig. network
Faster and remote provisioningBandwidth-on-demand Better bandwidth utilization; transform bandwidth capacity to revenue generating services
Automated network reconfiguration and restoration Flexibility, security and cost-effectiveness
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Optoplex Confidential 3
ROADM Optical Networks
MetroMetro
CustomersCustomers
Intercity Intercity
MetroMetro
CustomersCustomers
ROADM
Optical core switch
AB
Source: AT&T
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Optoplex Confidential 4
ROADM Technologies
WB (wavelength blocker) + 2-port tunable filter
WSS (wavelength selective switch)
TOADM (tunable optical add/drop module)
WSS+ TOADM
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Optoplex Confidential 5
ROADM (1)(WB + 2-port tunable filters)
In Express Out
AddDrop
1xM Couplers
……
…
… TF Arrays
……
…
…
WBLoss >12 dB
Loss >10 dB
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Optoplex Confidential 6
Application of TF and TOADM
…
Drop……
In
Express Out
Add
1xM Couplers
…
…
Drop……
2-port TF Arrays
……
…
…
WB
Broadcast-and-Select ROADM
3-port TOADM
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Optoplex Confidential 7
ROADM (2)Wavelength Selective Switch (WSS)
In Express
Drop Channels
Add Channels
Loss ~5 dB
Grating Demux + MEMS Switchs
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Optoplex Confidential 8
ROADM (3)3-Port Tunable filter(TOADM)
Drop Channels
In
Add Channels
Loss ~3 dB
Loss <4 dB
Express Out
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Optoplex Confidential 9
ROADM (4)WSS + TOADM
InExpress Out
…
Drop……
…
Drop……
…
Drop……
…
Drop……
WSS
WSS re-groups inputs signals into 4 setsTOADM demux signals in each sub-set
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Optoplex Confidential 10
Tunable Filter Technology Comparison
3-Port
Multi-cavity
(Thin-film based)
Single cavity (MEMS Based)
LatchingAthermalHigh Ch. Isolation
Passband Flat-
topTechnology
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Optoplex Confidential 11
TOADM
Same size as a credit card
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Optoplex Confidential 12
Filter Tuning Mechanism
Express channel
d
θAll
wavelength
λdrop
λdrop= f (n,d,θ )
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Optoplex Confidential 13
TOADM Performance (1)
Drop Channels (100 GHz 3-port, single channel)
-40
-35
-30
-25
-20
-15
-10
-5
0
1525 1530 1535 1540 1545 1550 1555 1560 1565nm
dB
Wavelength (nm)
Inse
rtio
n Lo
ss (d
B)
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Optoplex Confidential 14
TOADM Performance (2)
Express Channels (100 GHz 3-port, s ingle channel)
-40
-35
-30
-25
-20
-15
-10
-5
0
1525 1530 1535 1540 1545 1550 1555 1560 1565
nm
dB
Wavelength (nm)
Inse
rtio
n Lo
ss (d
B)
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Optoplex Confidential 15
100 GHz Tunable Filter Performance (3)
IL vs Channel Number
1.35
1.40
1.45
1.50
1.55
1.60
1.65
0 10 20 30 40
Channel Number
Inse
rtio
n Lo
ss (d
B) Drop Channel
(100 GHz 3-port, single channel)
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Optoplex Confidential 16
100 GHz Tunable Filter Performance (4)
Bandwidth vs Channel Number
0.1
0.3
0.5
0.7
0.9
1.1
0 10 20 30 40
Channel Number
Ban
dwid
th (n
m)
PB @ 0.5dB
SB @ 25dB
Drop Channel(100 GHz 3-port, single channel)
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Optoplex Confidential 17
100 GHz Tunable Filter Performance (5)flat top, high isolation
Channel 20 (CW: 1561.42 nm)
-60
-50
-40
-30
-20
-10
0
1559.5 1560.5 1561.5 1562.5 1563.5
Wavelength (nm)
Inse
rtio
n Lo
ss (d
B)
Drop Channels
Express Channels
Channel 59 (CW: 1530.33 nm)
-60
-50
-40
-30
-20
-10
0
1528.2 1529.2 1530.2 1531.2 1532.2
Wavelength (nm)
Inse
rtio
n Lo
ss (d
B)
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Optoplex Confidential 18
TOADM Performance (6)performance at various temperatures
-70
-60
-50
-40
-30
-20
-10
0
1544 1545 1546 1547 1548
Wavelength (nm)
Inse
rtio
n Lo
ss (d
B)
Drop Ch 39, -10C
Exp Ch 39, -10C
Drop Ch 39, 5C
Exp Ch 39, 5C Drop Ch 39, 23C
Exp Ch 39, 23C
Drop Ch 39, 45C
Exp Ch 39, 45C
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Optoplex Confidential 19
Band-drop TOADM(Band drop TOADM + colorless demux)
Tunable Filter 4 Skip 0
Input
Express
4 Dropped Channels
Drop
Colorless Demux
Demux
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Optoplex Confidential 20
Band drop TOADM Performance (1)
Drop Channels (100 GHz 3-port, 4 skip 1)
-40
-35
-30
-25
-20
-15
-10
-5
0
1525 1530 1535 1540 1545 1550 1555 1560 1565nm
dB
Wavelength (nm)
Inse
rtio
n Lo
ss (d
B)
4 skip 0100 G, 4-skip-0, drop channels
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Optoplex Confidential 21
Band drop TOADM Performance (2)
Express Channels (100 GHz 3-port, 4 skip 1)
-40
-35
-30
-25
-20
-15
-10
-5
0
1525 1530 1535 1540 1545 1550 1555 1560 1565
nm
dB
Wavelength (nm)
Inse
rtio
n Lo
ss (d
B)
0100G, 4-skip-0 express channels
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Optoplex Confidential 22
Summary
It has been proved that thin-film based tunable optical add/drop (TOADM) technologies provides a cost-effective, high performance, low technical risk solution for building a reconfigurable optical network.