Universal optical signal receiver
First Claim
Patent Images
1. A system comprising:
- a photo detector configured to receive an input optical signal having selected wave bands which carry a plurality of channels, and to convert input optical signals into corresponding electrical signals;
a first circuit coupled to said photo detector for establishing a substantially constant power level across a selected plurality of signal channels; and
a second circuit coupled to said first circuit for interfacing with a coaxial cable, with reduced signal return.
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Accused Products
Abstract
An optical receiver communication system converts optical signals modulated by analog or digital waveforms to RF signals. The optical receiver contains an automatic level control circuit to adjust the electronic gain of the system across a broad bandwidth spectrum. Two impedance matching circuits are designed using broad band matching technique to expand the bandwidth for increasing the maximum receivable frequencies to 1 GHz. A RLC impedance matching circuit forms a resonant combination to maintain ±1 dB fluctuation between the low-and-high-frequency limits of the bandwidth, and a 75Ω impedance matching circuit creates a 180° phase shift between outgoing and incoming signals to ensure low return loss.
22 Citations
20 Claims
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1. A system comprising:
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a photo detector configured to receive an input optical signal having selected wave bands which carry a plurality of channels, and to convert input optical signals into corresponding electrical signals; a first circuit coupled to said photo detector for establishing a substantially constant power level across a selected plurality of signal channels; and a second circuit coupled to said first circuit for interfacing with a coaxial cable, with reduced signal return. - View Dependent Claims (2)
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3. A system comprising:
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a photo detector configured to receive an input optical signal having selected wave bands which carry a plurality of channels, and to convert input optical signals into corresponding electrical signals; a first circuit coupled to said photo detector for establishing a substantially constant power level across a selected plurality of signal channels; a second circuit coupled to said first circuit for interfacing with a coaxial cable, with reduced signal return; and further comprising a signal processing circuit coupled between said photo detector and said first circuit, said signal processing circuit comprising a pre-amplifier circuit, wherein said signal processing circuit further comprises an automatic level control circuit.
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4. A system comprising:
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a photo detector configured to receive an input optical signal having selected wave bands which carry a plurality of channels, and to convert input optical signals into corresponding electrical signals; a first circuit coupled to said photo detector for establishing a substantially constant power level across a selected plurality of signal channels; a second circuit coupled to said first circuit for interfacing with a coaxial cable, with reduced signal return; and further comprising a signal processing circuit coupled between said photo detector and said first circuit, said signal processing circuit comprising a pre-amplifier circuit, wherein said signal processing circuit further comprises a tilt circuit for adjusting amplitude change with frequency of said electrical signal.
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5. A system comprising:
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a photo detector configured to receive an input optical signal having selected wave bands which carry a plurality of channels, and to convert input optical signals into corresponding electrical signals; a first circuit coupled to said photo detector for establishing a substantially constant power level across a selected plurality of signal channels; a second circuit coupled to said first circuit for interfacing with a coaxial cable, with reduced signal return; and further comprising a post amplifier having an input coupled to said first circuit for amplifying received electrical signals.
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6. A system comprising:
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a photo detector configured to receive an input optical signal having selected wave bands which carry a plurality of channels, and to convert input optical signals into corresponding electrical signals; a first circuit coupled to said photo detector for establishing a substantially constant power level across a selected plurality of signal channels; a second circuit coupled to said first circuit for interfacing with a coaxial cable, with reduced signal return; and
further comprising a switch having a first input port coupled to said first circuit, and a second input port coupled to an input from a coaxial cable, and an output port coupled to said second circuit for selectively receiving signals from said first input port or said second input port.
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7. A system comprising:
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a photo detector configured to receive an input optical signal having selected wave bands which carry a plurality of channels, and to convert input optical signals into corresponding electrical signals; a first circuit coupled to said photo detector for establishing a substantially constant power level across a selected plurality of signal channels; a second circuit coupled to said first circuit for interfacing with a coaxial cable, with reduced signal return; and further comprising an output level monitor circuit having an input port coupled to said first and second circuits for receiving electrical signals, and an output port coupled to an automatic level control driver. - View Dependent Claims (8)
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9. An optical receiver system comprising:
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a photo detector disposed to receive an input optical signal having a plurality of channels at selected wave bands for converting said input optical signal to a corresponding electrical signal; a first impedance matching circuit coupled to said photo detector for maintaining a consistent power level across a plurality of channels; and a second impedance matching circuit coupled to said first impedance matching circuit for transmitting said electrical signals onto a coaxial cable with reduced return loss. - View Dependent Claims (10, 11, 12)
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13. An optical receiver system comprising:
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a photo detector disposed to receive an input optical signal having a plurality of channels at selected wave bands for converting said input optical signal to a corresponding electrical signal; a first impedance matching circuit coupled to said photo detector for maintaining a consistent power level across a plurality of channels, wherein said first impedance circuit comprises a series resistor-inductor-capacitor for resonating said electrical signal; a second impedance matching circuit coupled to said first impedance matching circuit for transmitting said electrical signals onto a coaxial cable with reduced return loss; and further comprising a signal processing circuit coupled between said photo dectector and said first impedance matching circuit, and comprises a pre-amplifier circuit having an input coupled to an output of said photo detector for increasing the amplitude of said electrical signal, wherein said signal processing circuit comprises an automatic level control circuit having an input coupled to an output of said pre-amplifier for maintaining the stability of said electrical signal by adjusting the amplitude of said electrical signal in a broad dynamic range transparent to 1310 nm and 1550 nm optical wavelengths. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for converting an optical signal into an RF signal over a selected radio frequency spectrum with a first impedance matching circuit and a second impedance matching circuit, comprising:
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receiving an optical signal and converting said optical signal into an RF signal; maintaining frequency deviations of said RF signal within ±
1 dB over a selected radio frequency spectrum with said first impedance matching circuit; andabsorbing a substantial portion of any reflected signal return from with said second impedance matching circuit.
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20. A circuit for transmitting radio frequency signals in a selected frequency range f1 to f2, comprising:
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a quarter wavelength connection at a selected frequency near f2, said quarter wavelength connection having first and second sides; an inductor having an inductance and a parasitic capacitance, connected to said first side, the inductance of said inductor being sufficiently high to prevent substantial leakage to ground; and a capacitor C having a selected capacitance "c", connected to said second side, said selected capacitance being sufficiently low to prevent substantial leakage to ground; wherein c=1/L (2 Π
f3)2 ,where c is a selected capacitance of capacitor C;f3 is a resonant frequency greater than f2; f2 is a frequency greater than f1; and L is an effective inductance determined by the effect of said parasitic capacitance acting through said quarter wavelength connection.
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Specification
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Current AssigneeARRIS Enterprises LLC (CommScope Holding Company, Inc.)
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Original AssigneeQualop Systems Corporation
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InventorsWang, Peter, Jou, Yue-Syan, Tu, Yong Cheng, Su, Chun-Meng, Ho, Ching
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Primary Examiner(s)NEGASH, KINFE MICHAEL
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Application NumberUS08/779,204Time in Patent Office869 DaysField of Search359/161, 359/189, 359/194, 250/214 A, 330/59, 330/308US Class Current398/209CPC Class CodesH04B 10/6931 Automatic gain control of t...
