Optischer Sender

摘要

An optical transmitter includes a semiconductor laser which is supplied with a frequency modulated current. An emitted light from the semiconductor laser is modulated in intensity by an intensity modulator in accordance with an information signal and becomes a signal light pulse. The spectral width DELTA nu m of the light and a power P s of the signal light pulse meet the following formulas: P s > Pth and $where\; P\; th\; is\; a\; threshold\; input\; light\; power\; when\; the\; stimulated\; Brillouin\; scattering\; begins\; to\; occur\; in\; the\; optical\; fiber\; in\; case\; of\; no\; frequency\; modulation\; of\; said\; light,\; DELTA\; nu\; B\; is\; the\; Brillouin\; gain\; bandwidth\; of\; the\; optical\; fiber,\; and\; DELTA\; nu\; s\; is\; the\; spectral\; width\; of\; the\; signal\; light\; in\; case\; of\; no\; frequency\; modulation\; of\; the\; light.\mathop{\mathrm{image}}$