Multi-channel digital signal optical fiber transmission test equipment

Abstract

The invention discloses a multi-channel digital signal optical fiber transmission test equipment, aiming to provide a test equipment with stable test performance and high reliability. The signal is divided into 16 channels of equal-amplitude and in-phase signals through the power divider chassis, and sent to the dual-channel AD board group in the main control chassis to convert into digital electrical signals, which are connected to each AD board through the GTX high-speed connector. Send it into the optical fiber chassis, and convert it into 64 optical signals through the electro-optical conversion module groups connected to each other. The 64 optical signals are combined into 4 optical signals through four DWDM dense wavelength division multiplexers, and then combined into 1 optical signal through the optical matrix switch. Send to the device under test; the device under test sends out 1 optical signal and divides it into 2 optical signals through the optical matrix switch, and enters the DWDM dense wave decomposition multiplexer respectively to form 16 optical signals of different wavelengths. The analog-to-DA conversion is restored to an analog signal, and the bit error rate test is performed by a standard instrument.

Description

technical field [0001] The invention relates to a test equipment to be tested for multi-channel optical fiber signal transmission, especially suitable for testing and verifying equipment for multi-channel digital signal optical fiber transmission. Background technique [0002] Optical fiber communication is a communication technology that transmits information through optical fibers. At the sending end, the information is converted and processed into an electrical signal that is convenient for transmission. The light source is controlled by the electrical signal, so that the emitted optical signal has the characteristics of the electrical signal to be transmitted, thereby realizing the electrical-optical conversion of the signal. The optical signal is transmitted to the remote receiving end through optical fiber, and converted into an electrical signal by photodiode and other devices, thereby realizing the optical-electrical conversion of the signal. The electrical signal i...

AI Technical Summary

Problems solved by technology

Although this method is simple, there are several problems: (1) when long-connected 0s or long-connected 1s appear in the digital sequence, it will bring problems to the timing information extraction work of regenerative repeaters and terminal optical receivers on optical fiber lines. Difficult; (2) Simple unipolar codes contain DC components

Since 1 and 0 in the optical pulse on the line change randomly, this will cause the DC component of the unipolar code to also change randomly. This random DC component can be caused by the AC coupling circuit of the optical receiver. The baseline drift of digital signals brings difficulties to the judgment and regeneration of digital signals

(3) Bit error detection without interruption of communication services cannot be realized

(4) Because the optical receiver adopts capacitive coupling, the receiver cannot respond to the DC component and low frequency component, so that the amplitude of the long continuous zero signal gradually decreases, and a bit error will occur after the judgment circuit

As a medium for transmitting high-speed data, the requirements for cables are relatively strict. Once a cable fails, it can lead to the paralysis of the entire network system in severe cases.

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