Architecture for wireless transmission of high rate optical signals
First Claim
1. An apparatus for wireless transmission of high data rate optical signals comprising:
- an electrical converter for converting a received optical signal containing a high data rate digital signal to a received electrical signal;
a clock and data recovery circuit for recovering the high data rate signal from the received electrical signal;
an encoder for encoding the high data rate signal as an encoded electrical signal;
a symbol modulator for modulating the encoded electrical signal to produce a Quadrature Amplitude Modulated (QAM) signal at an intermediate frequency (IF); and
a microwave up converter for converting the QAM-IF signal to a single carrier microwave radio frequency carrier signal, andwherein the microwave up converter converts the QAM-IF signal to a millimeter wave signal at 20 Gigahertz or higher.
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Accused Products
Abstract
An apparatus for a wireless transmission of high data rate signals such as received from an optical interface including gigabit fiber channel or a sonet. The architecture combines direct detection of the optical signal with clock and data recovery circuit and a differential signal encoder which is preferably a differential quadrature phase shift encoder and modulator pair. A millimeter wave, local oscillator and up conversion chain converts the optical input signal to a microwave carrier. In the opposite direction, the down converted signal is non-coherently phase detected and fed to a pair of synchronized clock and data recovery circuits to recover I and Q channel signals. These recovered signals are then combined prior to re-timing before they are fed back to the optical transceiver.
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Citations
28 Claims
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1. An apparatus for wireless transmission of high data rate optical signals comprising:
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an electrical converter for converting a received optical signal containing a high data rate digital signal to a received electrical signal; a clock and data recovery circuit for recovering the high data rate signal from the received electrical signal; an encoder for encoding the high data rate signal as an encoded electrical signal; a symbol modulator for modulating the encoded electrical signal to produce a Quadrature Amplitude Modulated (QAM) signal at an intermediate frequency (IF); and a microwave up converter for converting the QAM-IF signal to a single carrier microwave radio frequency carrier signal, and wherein the microwave up converter converts the QAM-IF signal to a millimeter wave signal at 20 Gigahertz or higher. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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2. An apparatus for wireless transmission of high data rate optical signals comprising:
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an electrical converter for converting a received optical signal containing a high data rate digital signal to a received electrical signal; a clock and data recovery circuit for recovering the high data rate signal from the received electrical signal; an encoder for encoding the high data rate signal as an encoded electrical signal; a symbol modulator for modulating the encoded electrical signal to produce a Quadrature Amplitude Modulated (QAM) signal at an intermediate frequency (IF); and a microwave up converter for converting the QAM-IF signal to a single carrier microwave radio frequency carrier signal, and wherein the high data rate signal is a synchronized serial data stream containing higher level protocol layer information, such that the data recovery circuit, encoder, symbol modulator and microwave up converter are protocol independent and do not require further information concerning the received signal.
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3. An apparatus for wireless transmission of high data rate optical signals comprising:
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an electrical converter for converting a received optical signal containing a high data rate digital signal to a received electrical signal; a clock and data recovery circuit for recovering the high data rate signal from the received electrical signal; an encoder for encoding the high data rate signal as an encoded electrical signal; a symbol modulator for modulating the encoded electrical signal to produce a Quadrature Amplitude Modulated (QAM) signal at an intermediate frequency (IF); and a microwave up converter for converting the QAM-IF signal to a single carrier microwave radio frequency carrier signal additionally comprising; a frequency multiplier, connected to the microwave up converter, for multiplying the microwave radio frequency carrier signal by a frequency multiplication factor. - View Dependent Claims (20)
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4. An apparatus for wireless transmission of high data rate optical signals comprising:
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an electrical converter for converting a received optical signal containing a high data rate digital signal to a received electrical signal; a clock and data recovery circuit for recovering the high data rate signal from the received electrical signal; an encoder for encoding the high data rate signal as an encoded electrical signal; a symbol modulator for modulating the encoded electrical signal to produce a Quadrature Amplitude Modulated (QAM) signal at an intermediate frequency (IF); and a microwave up converter for converting the QAM-IF signal to a single carrier microwave radio frequency carrier signal, and further wherein a diplexer is used to couple the microwave radio frequency carrier signal to an antenna.
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5. An apparatus for wireless transmission of high data rate optical signals comprising:
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an electrical converter for converting a received optical signal containing a high data rate digital signal to a received electrical signal; a clock and data recovery circuit for recovering the high data rate signal from the received electrical signal; an encoder for encoding the high data rate signal as an encoded electrical signal; a symbol modulator for modulating the encoded electrical signal to produce a Quadrature Amplitude Modulated (QAM) signal at an intermediate frequency (IF); and a microwave up converter for converting the QAM-IF signal to a single carrier microwave radio frequency carrier signal and further wherein an Ortho-Mode Transducer is used to couple the microwave radio frequency carrier signal to an antenna, and wherein a data rate of the received optical signal exceeds 100 megabits per second.
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6. An apparatus for wireless transmission of high data rate optical signals comprising:
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an electrical converter for converting a received optical signal containing a high data rate digital signal to a received electrical signal; a clock and data recovery circuit for recovering the high data rate signal from the received electrical signal; an encoder for encoding the high data rate signal as an encoded electrical signal; a symbol modulator for modulating the encoded electrical signal to produce a Quadrature Amplitude Modulated (QAM) signal at an intermediate frequency (IF); and a microwave up converter for converting the QAM-IF signal to a single carrier microwave radio frequency carrier signal, and further wherein a circulator is used to couple the microwave radio frequency carrier signal to an antenna.
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7. An apparatus for receiving a microwave frequency radio signal containing a high data rate digital signal and converting it to a wire transport signal comprising:
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a down converter for converting the microwave frequency signal to an intermediate frequency signal; a QAM symbol decoder for decoding the IF input into I and Q signals with the decoder including at least a pair of data recovery circuits to produce an I data signal representing inphase symbols at ½
the data rate and a Q data signal representing quadrature symbols at ½
the data rate;a parallel to serial converter for combining the I and Q data signals into a recovered data signal; and a wire transport converter for converting the recovered data signal to a transport signal format wherein the QAM symbol decoder is a known non-coherent symbol decoder. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification