Method for estimating bandwidth limiting effects in high frequency transmission communication systems
First Claim
1. A method for estimating a bandwidth limiting penalty of a chain of bandpass optical filters in an optical telecommunication system adapted to carry an optical signal having bit rate not less than 10 Gb/s, and wherein average bandwidth of the filters in the chain is of the same order of magnitude as bandwidth of the optical signal transmitted in the system, the method comprises:
- selecting a worst case filter,performing checking of said system, by testing and/or simulating the system being provided with the selected worst case filter instead of the chain of said bandpass filters, andjudging about the bandwidth limiting penalty of the chain of said bandpass filters based on results of the checking and a predetermined maximal value of bandwidth limiting penalty.
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Abstract
A method for estimating a bandwidth limiting penalty of a chain of bandpass optical filters in an optical telecommunication system. The method is advantageous for systems carrying an optical signal at a bit rate of about 10 Gb/s, wherein average bandwidth of the filters in the chain is of the same order of magnitude as bandwidth of the optical signal. The method comprises selecting a worst case filter, checking the system by testing and/or simulating it as being provided with the selected worst case filter instead of the chain of filters, and then judging about the bandwidth limiting penalty of the chain of filters based on results of the checking.
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Citations
20 Claims
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1. A method for estimating a bandwidth limiting penalty of a chain of bandpass optical filters in an optical telecommunication system adapted to carry an optical signal having bit rate not less than 10 Gb/s, and wherein average bandwidth of the filters in the chain is of the same order of magnitude as bandwidth of the optical signal transmitted in the system, the method comprises:
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selecting a worst case filter, performing checking of said system, by testing and/or simulating the system being provided with the selected worst case filter instead of the chain of said bandpass filters, and judging about the bandwidth limiting penalty of the chain of said bandpass filters based on results of the checking and a predetermined maximal value of bandwidth limiting penalty. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for estimating a bandwidth limiting penalty of a chain of bandpass optical filters in an optical telecommunication system adapted to carry an optical signal having bit rate not less than 10 Gb/s, and wherein average bandwidth of the filters in the chain is of the same order of magnitude as bandwidth of the optical signal transmitted in the system, the method comprises:
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selecting a worst case filter, checking performance of the optical telecommunication system by transmitting an optical signal using an optical transmitter, and measuring at a receiver its power after said optical signal has passed through the selected worst case filter instead of through the chain of said bandpass filters, and estimating the filtering bandwidth narrowing effect of the chain of said bandpass filters based on results of the checking. - View Dependent Claims (14, 15, 16, 17)
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18. An optical telecommunication system comprising:
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a transmitter operative to transmit to a receiver an optical signal having a bit rate of not less than 10 Gb/s, through optical fibers; a worst case filter connected between the transmitter and the receiver, wherein the worst case filter has a bandwidth “
BWWCase filter”
substantially within the range determined by the following expression;
0.30*BWsignal≦
BWWCase filter≦
0.8*BWsignal;
measuring means operative to measure the optical signal after its passing through the worst case filter, instead of through a chain of the bandpass filters; and calculating means operative to estimate the filtering bandwidth narrowing effect of the optical telecommunication system, and to enable determining whether the system will operate under a predetermined value of the bandwidth limiting penalty. - View Dependent Claims (19, 20)
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Specification