What is difference between the Optical amplifiers used in Submarine technology & Terrestrial Technology. Is there any difference at the terminal Station.Please share any specific Document available
Typically an MLA2 or MLA3 is used as part of the final SLTE optical drive. From here the wetplant amplifies provide the rest of the OLA. the Document you are looking to read up on to assist in understanding subsea equipment ordering is NTRN72AA - Submarine Networking Application Guide
Yes right i m asking difference in wet plant & terrestrial ILA.As i understand that terrestrial is amplifiers fluctuates the o/p power depending upon the Input power received to it.While Submarine wet plant repeaters are having constant o/p power. We need to fill the spectrum in submarine to provide the constant o/p power as we do not perfrom in terrestrial segment & so on........
Right Subsea amps operate in constant power mode, IE regardless of the input levels, they maintain a constant output level. To assist in this process, amplified subsea links typically depend on the SLTE to provide idlers. These idlers provide a spectrum fill for unused channels to help ensure linearity by consuming unused amplifier power. There is a lot of physics occurring here, in how EDFA (Erbium-Doped Fibers Amplifiers) works which once understood explains the necessity of consuming unused amplifier power. In Ciena SLTE equipment you would normally find idler's being comprised of either a CW (Continuous Wave) based SLIC, or ASE carved idlers (or both). The ASE based solutions are becoming more prevalent in new builds due to coherent 40G and 100G deployments.
While the amplifiers used in both terrestrial and submarine application maybe similar, the way they are set up are different as you have pointed out. You are right that power for terrestrial amps depends on the input power received and they are normally set to Gain mode. While on the submarine application, power for the amps are set to full capacity on day one hence the need for another amp to provide ASE to fill the spectrum. Adding new service to the submarine system means using the existing ASE channel. Amps used in submarine application are usually set to Power mode.
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