Optical transmission system having reduced modal noise

Details Optical transmission system having reduced modal noise Optical transmission system having reduced modal noise

1981-07-13

1984-01-24

Sikes, William L.

Coherent light generators

Particular component circuitry

Optical pumping

372108, G20B 514

Patent

active

044272618

ABSTRACT:
An optical fiber (5) is coupled to an end face (5) of a semiconductor laser diode and the other end face is coupled to one end of a monomode optical waveguide. The other end of waveguide is terminated in a reflecting manner, e.g. by mirror, to reduce the coherence length of the laser. Thus, so-called "speckle patterns" are only produced in the transmission fiber over a short distance from the laser and modal noise further on in the transmission fiber can be prevented by avoiding the use of non-ideal fiber couplings or other connections having a spatial filter effect within this short distance from the laser.

REFERENCES:
patent: 4143940 (1979-03-01), Khoe
patent: 4286232 (1981-08-01), Puech et al.
patent: 4325605 (1982-04-01), Winzer et al.
patent: 4351585 (1982-09-01), Winzer et al.
Yamaoka et al., "Fiber Mounted Semiconductor Devices for Optical Communication Systems", Fujistsu Labs. Ltd., Kawasaki Japan, 1975.

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