Abstract

Modal noise, which can cause severe distortion in signals transmitted by fiber optics, is an interference effect that is made more severe by the narrow spectral width of single-mode lasers. The linearity of these devices may be totally obscured after the optical signal has passed through the connectors and fiber lengths of a practical signal system. Dithering the laser’s operating point by means of a high-frequency current (>2 GHz) has been found greatly to reduce modal noise.

© 1979 Optical Society of America

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References

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  1. R. E. Epworth, “The phenomenon of modal noise in fiber systems,” presented at the Topical Meeting on Optical Fiber Communication, Washington, D. C., March 8, 1979.
  2. Mitsubishi Laser Diode ML-2000 Series Technical Note (Semiconductor Laboratory, Mitsubishi Electric Corporation, 4-1 Mizuhara, Itami, Hyogo, 664, Japan, December1978), Sec. 2.3, p. 6.

Epworth, R. E.

R. E. Epworth, “The phenomenon of modal noise in fiber systems,” presented at the Topical Meeting on Optical Fiber Communication, Washington, D. C., March 8, 1979.

Other (2)

R. E. Epworth, “The phenomenon of modal noise in fiber systems,” presented at the Topical Meeting on Optical Fiber Communication, Washington, D. C., March 8, 1979.

Mitsubishi Laser Diode ML-2000 Series Technical Note (Semiconductor Laboratory, Mitsubishi Electric Corporation, 4-1 Mizuhara, Itami, Hyogo, 664, Japan, December1978), Sec. 2.3, p. 6.

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Figures (2)

Fig. 1
Fig. 1

10-kHz sine-wave signal showing modal distortion after being transmitted through 1 km of graded index fiber.

Fig. 2
Fig. 2

Same signal as in Fig. 1, but with modal distortion suppressed by application of dither signal to laser.

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