Optoplex Confidential 1

Tunable Filter based Optical Add/Drop Technology

(TOADM)Jay Hsieh, Optoplex Corporation

Fremont, CA

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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ROADM Optical Networks

MetroMetro

CustomersCustomers

Intercity Intercity

MetroMetro

CustomersCustomers

ROADM

Optical core switch

AB

Source: AT&T

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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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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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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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ROADM (2)Wavelength Selective Switch (WSS)

In Express

Drop Channels

Add Channels

Loss ~5 dB

Grating Demux + MEMS Switchs

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ROADM (3)3-Port Tunable filter(TOADM)

Drop Channels

In

Add Channels

Loss ~3 dB

Loss <4 dB

Express Out

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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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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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TOADM

Same size as a credit card

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Filter Tuning Mechanism

Express channel

d

θAll

wavelength

λdrop

λdrop= f (n,d,θ )

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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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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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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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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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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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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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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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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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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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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.