1.Dual Fiber OADM Applications Upgrade port Upgrade port Point to point with in-service upgrade Ch#1 Ch#8 Ch#1 Ch#7 λ1 – λ7 Mux/DeMux λ1 – λ8 λ8 Point to point with middle point service (unidirectional)

2.Dual Fiber OADM Applications Ch#1 Ch#8 Ch#1 Ch#8 λ1 – λ8 Mux/DeMux λ1 – λ8 Point to point with middle point service (bi-directional) λ8 to Westλ8 to East Ch#1 Ch#8 Mux/DeMux λ1 – λ8 λ1λ2λ3 λ4 λ5 – λ8 Linear Add/Drop network

3.Dual Fiber OADM Applications λ2λ1λ2 Protected Ring λ1 λ2 λ1 λ3 λ1 λ3 Node 1 Node 2 Node 3 Node 4 Node 5

4.Dual Fiber OADM Applications λ2λ1λ2 λ1 Unprotected Ring λ1 λ2 λ1 λ2 Node 1 Node 2 Node 3 Node 4 Node 5

1.Single Fiber OADM Applications Point to point Add 1 Drop 1 InOut Drop 2 Add 2 Add 1 Drop 1 InOut Drop 2 Add 2 Ch#1 Ch#8 Ch#1 Ch#8 λ1 – λ8 Mux/DeMux λ1 – λ8 Point to point with middle point service (bi-directional) AddDrop InOut λ8 2 channels OADM Single channel OADM AddDrop In Out Rx1 Tx1Rx2 Tx2 Terminal equipment

2.Single Fiber OADM Applications Ch#1 Ch#4 Ch#1 Ch#4 λ1 – λ8 DeMux λ1 – λ8 Single fiber Point to point with middle point service (bi-directional) Add 1 Drop 1 InOut Drop 2 Add 2 (λ8) (λ7) (λ8) λ1 – λ6 DeMux λ1 – λ8 Single fiber Linear Add/Drop network (λ7) Add 1 Drop 1 InOut Drop 2 Add 2 (λ8)(λ7) (λ8) Add 1 Drop 1 InOut Drop 2 Add 2 (λ5)(λ6) (λ5)(λ6) 2 channels OADM

3.Single Fiber OADM Applications Protected Ring λ3 Node 2 λ2 Node 4 AddDrop InOut AddDrop InOut λ1 Node 5 AddDrop InOut AddDrop InOut λ3 Node 1 Add Drop In Out Add Drop In Out λ2 AddDrop InOut AddDrop InOut AddDrop InOut AddDrop InOut λ1 Node 3 Add Drop In Out Add Drop In Out

4.Single Fiber OADM Applications Unprotected Ring λ2 Node 2 λ1 Node 4 AddDrop InOut AddDrop InOut λ1 Node 5 AddDrop InOut AddDrop InOut λ2 Node 1 Add Drop In Out Add Drop In Out λ1 AddDrop InOut AddDrop InOut AddDrop InOut AddDrop InOut λ1 Node 3 Add Drop In Out Add Drop In Out