Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1995-03-21
1997-08-12
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359333, 359180, 359181, H01S 300, H04B 1004
Patent
active
056571534
ABSTRACT:
In an optical transmission medium, such as a fiber amplifier, two optically distinguishable signals with complementary modulation are both inputted into the amplifying medium for encoding information, particularly a serial stream of digital data, or alternatively, redundant encoding of pulses. The gain profile in the medium is preferably maintained approximately constant at all times, so that whichever amplified signal is used as the primary information carrier, its output intensity will be substantially stable from pulse to pulse, independent of recent pulse history. The two complementary signals may have different orthogonal linear polarizations or wavelengths with the same stimulated emission cross-section, so that the population inversion profile stays constant, whichever signal happens to be on at a given moment. The two signals may be derived from separate intensity modulated laser diode signal sources, from a single laser diode signal source switched between two emission wavelengths, or from a single laser diode with constant emission coupled to a directional coupler directing two complementary polarized light signals into the fiber amplifying medium.
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Endriz John
Sanders Steven
Scifres Donald R.
Waarts Robert G.
Welch David F.
Hellner Mark
Schneck Thomas
SDL Inc.
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