N-GEN Communications Web-based Seminars ©NGCS

Seminar - An Overview of Communications Technologies

Module 5 - SONET, WDM, DWDM and B-ISDN Technologies                                                              Slide 12 of 76 _________________                                                                                  __________

                         Windows Within Infrared Spectrum Exploited for
                                     Data Transmission Through Fiber

                                First Window - near 850 nanometers

                                Second Window - near 1310 nanometers 

                                Third Window - near 1550 nanometers

                                Fourth Window - near 1550 nanometers

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Commercial optical communications systems are designed for special applications.

First Window - A near 850 nanometer wavelength from a light source is used with multi-mode fiber. These systems are designed for short range transmission applications.

Second Window - A near 1310 nanometer wavelength from a light source is used with single-mode fiber.

Third Window - A near 1550 nanometer wavelength from a light source is used with single-mode fiber. These systems are designed to meet the requirements for DWDM systems.

Fourth Window - A 1550 nanometer wavelength from a light source is used with single-mode fiber. These systems are designed with dispersion-shifted fiber and are not suitable for DWDM applications.