[NANOG] DWDM More Details

John Lee john at internetassociatesllc.com
Fri Apr 25 17:26:07 UTC 2008


Do you want

      CWDM - Course Wave Division Multiplexing -           >  100 nm optical spacing   1 - 10 x 2.5 - 10 Gbps lambdas
      DWDM - Dense Wave Division Multiplexing   -           =    50 nm optical spacing  20 - 40  x 2.5 - 10 Gbps
    UDWDM - Ultra Dense Wave Division Multiplexing -    <    50 nm optical spacing  40 - 80  x 2.5 - 10 Gbps

What size area do you want

    CAN - Campus Area Network   1 - 5 Miles    Short Optics, No amplifiers
   MAN - Metro Area Network     10 - 40 Miles  Medium Optics, No amplifiers
   WAN - Wide Area Network       150   Miles between In Line Amplifiers (ILA)  Long haul optics, EDFA or Ramiun Amps
ULHWAN - Ultra Long Haul        600 - 800 Miles between ILA, ULH optics, Ramiun Amps

What type of fiber do you want to use?

SMF, Zero dispersion, phase shifted, etc.. This one you usually cannot control fiber since it depends on who you lease or buy the fiber from.

Running the fiber cost the money.

There are now a large number of regional fiber providers with Level (3) having the "most available" dark or lite fiber nationally in the US.

Alcaltel/Lucent, ADVA, Ciena, Cisco and the Chinese are normal list of optical equipment providers and Siemens, Ericson and others.

Subscribe to Lightwave (at no charge) and look at the back issues for networks. Show up at Supercom or OFC or what is replacing them and get the latest on ROADM, full channel tunable lasers and maintenance costs.

What size of network do you want to grow to before replacing the optical link equipment including ILAs?

Most any org can cost justify a CWDM / CAN since you can add one fiber pair at a time and one lambda per fiber pair.

DWDM gear is much more expensive and is aimed at 20 to 40 lambdas per fiber for service providers while UDWDM and ULHWAN are aimed at trans oceanic links and are very very expensive.

John (ISDN) Lee

From: Scott E. MacKenzie [smackenzie at qf.org.qa]
Sent: Friday, April 25, 2008 4:00 AM
Subject: [NANOG] DWDM

Does anyone know where I can locate a list of DWDM networks deployed for
Education, Science & Research, and Commercialization?

We need to determine the practicality of DWDM use...


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