Optical transmission equipment and integrated circuit
First Claim
Patent Images
1. Optical transmission equipment comprising:
- an optical modulation unit including a plurality of optical modulators coupled to an internal optical transmission path; and
an electric circuit unit for generating a plurality of high-speed serial digital signal streams to be supplied to said optical modulation unit, wherein said electric circuit unit includes;
a plurality of parallel signal paths each for transferring an N-bit-parallel low-speed digital signal stream (N is an integer more than
1);
a plurality of multiplexing circuits each for converting the N-bit-parallel low-speed digital signal stream received from one of said parallel signal paths into a high-speed serial digital signal stream to be supplied to said optical modulation unit; and
a delay control buffer circuit inserted in at least one of said parallel signal paths to receive the N-bit-parallel low-speed digital signal stream, wherein said delay control buffer circuit performs delay adjustment on the N-bit-parallel low-speed received digital signal stream, with the timing unit of a bit period of the high-speed serial digital signal stream or with a timing unit corresponding to an integral fraction of the bit period and outputs the resultant digital signal stream to the parallel signal path.
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Abstract
Optical transmission equipment, capable of electrically adjusting the delay difference between a plurality of digital signal paths to be connected to a multilevel optical modulation unit or demodulation unit, having multiplexing circuits connected to the digital signal paths and a delay adjustment unit inserted in one of the digital signal paths to adjust delay of N-bit-parallel low-speed digital signals with the timing unit of a bit period of a high-speed serial digital signal to be outputted from multiplexing circuit.
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Citations
18 Claims
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1. Optical transmission equipment comprising:
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an optical modulation unit including a plurality of optical modulators coupled to an internal optical transmission path; and
an electric circuit unit for generating a plurality of high-speed serial digital signal streams to be supplied to said optical modulation unit, wherein said electric circuit unit includes;
a plurality of parallel signal paths each for transferring an N-bit-parallel low-speed digital signal stream (N is an integer more than
1);
a plurality of multiplexing circuits each for converting the N-bit-parallel low-speed digital signal stream received from one of said parallel signal paths into a high-speed serial digital signal stream to be supplied to said optical modulation unit; and
a delay control buffer circuit inserted in at least one of said parallel signal paths to receive the N-bit-parallel low-speed digital signal stream, wherein said delay control buffer circuit performs delay adjustment on the N-bit-parallel low-speed received digital signal stream, with the timing unit of a bit period of the high-speed serial digital signal stream or with a timing unit corresponding to an integral fraction of the bit period and outputs the resultant digital signal stream to the parallel signal path. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12)
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7. Optical transmission equipment comprising:
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an optical modulation unit including a plurality of optical modulators coupled to an internal optical transmission path; and
an electric circuit unit for generating a plurality of high-speed serial digital signal streams to be supplied to said optical modulation unit, wherein said electric circuit unit includes;
a plurality of parallel signal paths each for transferring an N-bit-parallel low-speed digital signal stream (N is an integer more than
1) encoded by an encoder;
a plurality of multiplexing circuits each connected to one of said parallel signal paths to convert the N-bit-parallel low-speed digital signal stream into a high-speed serial digital signal stream to be supplied to said optical modulation unit; and
at least one delay adjustment unit for adjusting delay of the N-bit-parallel low-speed digital signal stream in at least one of said parallel signal paths, with the timing unit of a bit period of the high-speed serial digital signal stream and accurately adjusting the delay within the bit period by controlling the output timing of each bit in the high-speed serial digital signal stream to be outputted from said multiplexing circuit connected to the signal path.
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13. Optical transmission equipment comprising:
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an optical demodulation unit for converting a multilevel modulated optical signal received from an external optical transmission path into a plurality of electric high-speed serial digital signal streams and outputting the plurality of high-speed serial digital signal streams; and
an electric circuit unit for converting the plurality of high-speed serial digital signal streams received from said optical demodulation unit into a plurality of low-speed digital signal streams and outputting the plurality of low-speed digital signal streams, wherein said electric circuit unit comprises;
a plurality of parallel signal paths each for transferring an N-bit-parallel digital signal stream (N is an integer more than
1);
a plurality of demultiplexers each for converting one of said high-speed serial digital signal streams into an N-bit-parallel low-speed digital signal stream and outputting the N-bit-parallel low-speed digital signal stream to one of said parallel signal paths;
a delay control buffer circuit for performing delay adjustment on the N-bit-parallel low-speed digital signal stream, in at least one of said parallel signal paths, with the timing unit of a bit period of the high-speed serial digital signal stream or with a timing unit corresponding to an integral fraction of the bit period and outputting the resultant low-speed digital signal stream; and
at least one decoder for converting the plurality of N-bit-parallel low-speed digital signal streams received from said parallel signal paths into low-speed parallel digital signals in a different code. - View Dependent Claims (14, 15, 16)
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17. An integrated circuit for optical transmission equipment, the integrated circuit comprising:
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an encoder for receiving a plurality of N-bit-parallel low-speed digital signal streams (N is an integer more than
1);
a plurality of parallel signal paths each for transferring one of said N-bit-parallel low-speed digital signal streams outputted from said encoder;
a plurality of multiplexing circuits each for converting the N-bit-parallel low-speed digital signal stream received from one of said parallel signal paths into a high-speed serial digital signal stream to be supplied to an optical modulation unit;
a plurality of delay control buffer circuits each inserted in one of said parallel signal paths to perform delay adjustment on the N-bit-parallel low-speed digital signal stream, with the timing unit of a bit period of the high-speed serial digital signal stream or with a timing unit corresponding to an integral fraction of the bit period and output the resultant delay adjusted digital signal stream; and
means for selectively setting an amount of delay adjustment to each of said delay control buffer circuits.
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18. An integrated circuit for optical transmission equipment, the integrated circuit comprising:
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a plurality of demultiplexers each for receiving a high-speed serial digital signal stream, converting the received high-speed serial digital signal stream into an N-bit-parallel low-speed digital signal stream (N is an integer more than
1), and outputting the N-bit-parallel low-speed digital signal stream;
a plurality of parallel signal paths each for transferring the N-bit-parallel low-speed digital signal stream outputted from said demultiplexers;
a plurality of delay control buffer circuits each inserted in one of said parallel signal paths to perform delay adjustment on the N-bit-parallel low-speed digital signal stream, with the timing unit of a bit period of the high-speed serial digital signal stream or with a timing unit corresponding to an integral fraction of the bit period and output the resultant digital signal stream;
a decoder connected to said plurality of parallel signal paths; and
means for selectively setting an amount of delay adjustment to each of the delay control buffer circuits.
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Specification