Coherent light generators – Particular beam control device – Modulation
Patent
1996-11-15
1998-08-11
Bovernick, Rodney B.
Coherent light generators
Particular beam control device
Modulation
372 38, 359276, H01S 310
Patent
active
057937826
ABSTRACT:
A linearized external modulator transmitter with improved dynamic range includes a limiter and a subtractor, which each receive one or more time-varying input signals. The limiter generates a first signal with an amplitude that is confined to a range bounded by preset positive and negative levels, wherein, between the preset levels, the transmitter has an optical power output that is linearly related to the input signal. The first signal is passed through a predistortion circuit connected to an external modulator as well as into the subtractor, which generates a signal equal to the amount by which the input signal exceeds, either positively or negatively, the limited first signal. The subtractor sends the excess signal to a tunable gain circuit connected to a laser. The laser is connected to the external modulator, which generates the optical power output of the transmitter. The transmitter can be adapted to include dual sets of inputs--e.g., for digital and analog channels--and the preset negative limit can be eliminated for improved analog distortion performance at low power output levels.
REFERENCES:
patent: 5347529 (1994-09-01), Hoe
Bovernick Rodney B.
Ericsson Inc.
Wise Robert E.
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