Tunable Filter based Optical Add/Drop Technology (TOADM)

Tunable Filter based Optical Add/DropTechnology(TOADM)Jay Hsieh, Optoplex CorporationFremont, CAOptoplex Confidential 1

ROADM Optical NetworksROADMIntercityOpticalcoreswitchMetroMetroACustomersCustomersOptoplex Confidential Source: AT&T 3B

ROADM Technologies• WB (wavelength blocker) + 2-port tunablefilter• WSS (wavelength selective switch)• TOADM (tunable optical add/drop module)• WSS+ TOADMOptoplex Confidential 4

ROADM (1)(WB + 2-port tunable filters)WBInLoss >10 dB…………Drop1xM CouplersTFArrays…………AddExpress OutLoss >12 dBOptoplex Confidential 5

Application of TF and TOADMInWBExpress Out………Drop3-port TOADM…………Drop1xM Couplers2-port TFArrays…………AddBroadcast-and-SelectROADMOptoplex Confidential 6

ROADM (2)Wavelength Selective Switch (WSS)Add ChannelsInExpressDrop ChannelsGrating Demux + MEMS SwitchsLoss ~5 dBOptoplex Confidential 7

ROADM (3)3-Port Tunable filter(TOADM)Add ChannelsInDrop ChannelsLoss

ROADM (4)WSS + TOADMInWSSExpress Out………………Drop……Drop……Drop……DropWSS re-groups inputs signals into 4 setsTOADM demux signals in each sub-setOptoplex Confidential 9

Tunable Filter Technology ComparisonTechnologyPassband FlattopHigh Ch.IsolationAthermalLatching3-PortSingle cavity(MEMS Based)Multi-cavity(Thin-filmbased)Optoplex Confidential 10

TOADMSame size as a credit cardOptoplex Confidential 11

Filter Tuning MechanismExpresschanneldAllwavelengthθλ dropλ drop = f (n,d,θ )Optoplex Confidential 12

TOADM Performance (1)0Drop Channels (100 GHz 3-port, single channel)-5Insertion Loss (dB)dB-10-15-20-25-30-35-401525 1530 1535 1540 1545 1550 1555 1560 1565nmWavelength (nm)Optoplex Confidential 13

100 GHz Tunable Filter Performance (3)Insertion Loss (dB)1.651.601.551.501.451.40IL vs Channel NumberDrop Channel(100 GHz 3-port, single channel)1.350 10 20 30 40Channel NumberOptoplex Confidential 15

100 GHz Tunable Filter Performance (4)1.1Bandwidth vs Channel NumberBandwidth (nm)0.90.70.50.3PB @ 0.5dBSB @ 25dBDrop Channel(100 GHz 3-port,single channel)0.10 10 20 30 40Channel NumberOptoplex Confidential 16

100 GHz Tunable Filter Performance (5)flat top, high isolation0Channel 20 (CW: 1561.42 nm)Insertion Loss (dB)-10-20-30-40-50ExpressChannels-601559.5 1560.5 1561.5 1562.5 1563.5Wavelength (nm)0Channel 59 (CW: 1530.33 nm)DropChannelsInsertion Loss (dB)-10-20-30-40-50-601528.2 1529.2 1530.2 1531.2 1532.2Wavelength (nm)Optoplex Confidential 17

TOADM Performance (6)performance at various temperatures0-10Insertion Loss (dB)-20-30-40-50-60Drop Ch 39, -10CExp Ch 39, -10CDrop Ch 39, 5CExp Ch 39, 5CDrop Ch 39, 23CExp Ch 39, 23CDrop Ch 39, 45CExp Ch 39, 45C-701544 1545 1546 1547 1548Wavelength (nm)Optoplex Confidential 18

Band-drop TOADM(Band drop TOADM + colorless demux)InputDropDemuxTunable Filter4 Skip 0ColorlessDemuxExpress4 Dropped ChannelsOptoplex Confidential 19

Band drop TOADM Performance (1)0Drop 100 Channels G, 4-skip-0, (100 GHz drop 3-port, channels 4 skip 1) 0Insertion dB Loss (dB)-5-10-15-20-25-30-35-401525 1530 1535 1540 1545 1550 1555 1560 1565nmWavelength (nm)Optoplex Confidential 20

Band drop TOADM Performance (2)0Express 100G, Channels 4-skip-0 (100 express GHz 3-port, channels 4 skip 1) 0-5Insertion dB Loss (dB)-10-15-20-25-30-35-401525 1530 1535 1540 1545 1550 1555 1560 1565Wavelength nm (nm)Optoplex Confidential 21

Summary• It has been proved that thin-film based tunable opticaladd/drop (TOADM) technologies provides a costeffective,high performance, low technical risk solutionfor building a reconfigurable optical network.Optoplex Confidential 22