Optical Networks - _6_1 SONET_SDH_74

The number after the period indicates the fiber type

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specifies the target reach and the following number indicates the bit rate. The number after the period indicates the fiber type and operating wavelength: a blank or 1 indicates 1310 nm transmis- sion over standard single-mode fiber (G.652), 2 indicates 1550 nm transmission over for standard single-mode fiber (G.652), 3 indicates 1550 nm transmission over dispersion-shifted fiber (G.653), and 5 indicates 1550 nm transmission over nonzero-dispersion-shifted fiber (G.655). The trans- mitters include multilongitudinal mode (MLM) Fabry-Perot lasers and single-longitudinal mode (SLM) DFB lasers, as well as light-emitting diodes (LEDs). The two values of the dispersion limit correspond, respectively, to the two choices of the transmitter. ffs indicates that the specification is for further study. This is the case for dispersion-limited links using directly modulated SLM lasers where no agreement has been reached on how to specify the chirp limits. Some of the applications are loss limited, and therefore the dispersion limit is not applicable (NA). Bit Rate Code Wavelength Fiber Loss Transmitter Dispersion (nm) (dB) (ps/nm) STM-1 I-1 1310 G.652 0-7 LED/MLM 18 / 25 S-1.1 1310 G.652 0-12 MLM 96 S-1.2 1550 G.652 0-12 MLM/SLM 296 / NA L-1.1 1310 G.652 10-28 MLM/SLM 246 / NA L-1.2 1550 G.652 10-28 SLM NA L-1.3 1550 G.653 10-28 MLM/SLM 296 / NA STM-4 I-4 1310 G.652 0-7 LED/MLM 14 / 13 S-4.1 1310 G.652 0-12 MLM 74 S-4.2 1310 G.652 0-12 SLM NA L-4.1 1310 G.652 10-24 MLM/SLM 109 / NA L-4.2 1550 G.652 10-24 SLM ffs L-4.3 1550 G.653 10-24 SLM NA V-4.1 1310 G.652 22-33 SLM 200 V-4.2 1550 G.652 22-33 SLM 2400 V-4.3 1550 G.653 22-33 SLM 400 U-4.2 1550 G.652 33-44 SLM 3200 U-4.3 1550 G.653 33-44 SLM 530 STM-16 I-16 1310 G.652 0-7 MLM 12 S-16.1 1310 G.652 0-12 SLM NA S-16.2 1550 G.652 0-12 SLM ffs L-16.1 1310 G.652 10-24 SLM NA L-16.2 1550 G.652 10-24 SLM 1600 L-16.3 1550 G.653 10-24 SLM ffs V-16.2 1550 G.652 22-33 SLM 2400 V-16.3 1550 G.653 22-33 SLM 400 U-4.2 1550 G.652 33-44 SLM 3200 U-4.3 1550 G.653 33-44 SLM 530
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386 Client Layers of the Optical Layer Table 6.3 Different physical interfaces for SDH (continued). Bit Rate Code Wavelength Fiber Loss Transmitter Dispersion (nm) (dB) (ps/nm) STM-64 I-64.1r 1310 G.652 0-4 MLM 3 . 8 I-64.1 1310 G.652 0-4 SLM 6 . 6 I-64.2r 1550 G.652 0-7 SLM 40 I-64.2 1550 G.652 0-7 SLM 500 I-64.3 1550 G.653 0-7 SLM 80 I-64.5 1550 G.655 0-7 SLM ffs S-64.1 1550 G.652 6-11 SLM 70 S-64.2 1550 G.652 3/7-11 SLM 800 S-64.3 1550 G.653 3/7-11 SLM 130 S-64.5 1550 G.655 3/7-11 SLM 130 L-64.1 1310 G.652 17-22 SLM 130 L-64.2 1550 G.652 11/16-22 SLM 1600 L-64.3 1550 G.653 16-22 SLM 260 L-64.3 1550 G.653 0-7 SLM ffs V-64.2 1550 G.652 22-33 SLM 2400 V-64.3 1550 G.653 22-33 SLM 400 0.5 dB/km at 1310 nm and 0.3 dB/km at 1550 nm for the other longer-distance ap- plications. Similarly, the chromatic dispersion numbers can be translated into target distances based on the dispersion parameter of the fiber used in the relevant operating range. These standards allow the use of optical power amplifiers and preamplifiers but do not include optical line amplifiers. With optical line amplifiers, we are now seeing spans without regeneration well in excess of the distance limits specified here. Today’s long-haul WDM systems with line amplifiers have regenerator spacings of about 400 to 600 km, with some ultra-long-haul systems extending this distance to a few thousand kilometers. The spans for such systems are vendor dependent and have not yet been standardized. (Note that the use of “long-haul” and “ultra-long-haul” in the context of WDM systems is different from their use in SDH terminology.) 6.1.6 Elements of a SONET/SDH Infrastructure Figure 6.8 shows different types of SONET equipment deployed in a network.
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