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Optical Networks - _Problems6_92

Optical Networks - _Problems6_92 - 464 WDM Network Elements...

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Unformatted text preview: 464 WDM Network Elements Problems 7.1 Consider a ring network with two intermediate adjacent nodes A and B, each with an OADM. (a) Consider the case where the OADM at node A adds wavelength λ 1 and the OADM at node B drops the adjacent wavelength λ 2 . Suppose the minimum received power is set at − 30 dBm and the transmit power is set at 0 dBm. Adjacent channel crosstalk at the receiver must be less than 15 dB. Assume that signals are added and dropped by the OADMs with no loss. What is the crosstalk suppression required at the OADM for the adjacent channel? How does this change with the link loss between the two nodes? (b) Next consider the case in which both OADMs drop and add wavelength λ 1 . We are worried about the case where some of the λ 1 power, instead of being dropped at the node, “leaks” through. The intrachannel crosstalk at the receiver must be at least − 30 dB below the desired signal. For the same assumptions as above, what is the intrachannel crosstalk suppression required at the OADM? How does this change with the link loss between the two nodes? 7.2 This problem illustrates some of the difficulties facing network planners when they have to use OADMs that are constrained in what channels they can add and drop....
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Optical Networks - _Problems6_92 - 464 WDM Network Elements...

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