Optical to microwave converter using direct modulation phase shift keying
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United States of America Patent
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May 25, 2004
Grant Date -
Nov 28, 2002
app pub date -
Jan 16, 2002
filing date -
May 22, 2001
priority date (Note) -
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Abstract
A point-to-point microwave radio link that operates in a Frequency Division Duplex (FDD) mode using direct digital modulation with a Continuous Phase Shift Keyed (PSK) scheme. The transmit signal is generated by a circuit that uses a Voltage-Control Oscillator (VCO) operating in a microwave radio band to obtain the modulated signal. The VCO output is fed to a phase modulator to obtain the modulated signal. The output of the VCO is then frequency multiplied by the predetermined factor to produce the modulated microwave output signal at the desired band.
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