Optical communications – Hybrid communication system
Reexamination Certificate
2006-07-11
2006-07-11
Tran, Dzung (Department: 2633)
Optical communications
Hybrid communication system
C398S076000, C398S183000, C398S186000, C398S187000, C385S024000, C385S027000
Reexamination Certificate
active
07076170
ABSTRACT:
An RF-lightwave transmitter performs successive conversions of an information-bearing input signal in order to generate an output signal suitable for transmission in a wireless communications system. The transmitter includes a high-efficiency FM laser connected to a FM discriminator. In operation, the laser converts an RF signal into a frequency-modulated optical signal, and the discriminator converts this signal into an amplitude-modulated optical signal. The discriminator performs its conversion using a high slope-efficiency linear transfer function which ensures that the AM optical signal varies in accordance with a desired operational performance. The transmitter also includes a photodiode which converts the AM signal output from the optical discriminator back into an RF signal for transmission. Experimental results demonstrated that a transmitter of this type is able to realize greater than 10 dB RF insertion gain at less than 0 dBm optical power, with a high spurious-free dynamic range and low noise. A signal processor embodied within the transmitter may be used in a purely optical communication systems or may be used for other types of RF-photonics applications such as those expected for use in next-generation systems.
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Fleshner & Kim LLP
Tran Dzung
University of Maryland Baltimore County
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