CWDM is used for short-range communications, so it employs wide-range frequencies with wavelengths that are spread far apart. Coarse WDM (CWDM): CWDM is defined by WDM systems with fewer than eight active wavelengths per fiber.Multiple high-bit-rate data streams of 10 Gb/s, 40 Gb/s, 100 Gb/s, 200 Gb/s and more recently, 400 Gb/s and 800 Gb/s, each carrying distinct throughputs, can be multiplexed over a single fiber. Over time, advances in optoelectronic components allowed the design of systems that simultaneously transmitted multiple wavelengths of light over a single fiber, significantly increasing fiber capacity. Early SONET systems used 1310 nanometer lasers to deliver 155 Mb/s data streams over very long distances.īut this capacity was quickly exhausted. As the need for information increased, so did the need for bandwidth. During the 1980s, fiber-optic data communications modems used low-cost LEDs to put near-infrared pulses onto low-cost fiber.
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