RRU5517t Hardware Description
Optical modules can be classified into single-mode and multimode optical modules, which can be distinguished as follows: The puller
How does an RRu optical module distinguish between receiving and emitting light
An RRU optical module distinguishes transmitting and receiving light by using separate components: a laser or LED for emission and a photodetector for reception, with signal processing ensuring proper separation and detection.
Transmitting Light
The optical module in an RRU emits light using a driver-controlled semiconductor laser (LD) or LED, which converts electrical signals from the baseband unit into modulated optical signals for transmission over fiber optic cables . The intensity of the emitted light corresponds to the data being transmitted, with the average optical power representing the proportion of "1"s in the digital signal. The extinction ratio measures the difference between the light intensity for logical "1" and "0", ensuring the transmitted signal is distinguishable and reliable .
Receiving Light
On the receiving side, the optical module uses a photodetector diode to convert incoming optical signals back into electrical signals. The module measures the received optical power, which must fall within the receiver's sensitivity range to avoid errors. If the received power is too low, the signal may not be detected correctly; if too high, it can cause overload and bit errors . Pre-amplification and signal conditioning are applied to ensure the electrical output accurately represents the transmitted data.
Signal Separation
In bidirectional fiber systems, transmit and receive paths are physically or optically separated. Some modules use separate fibers for Tx and Rx, while others employ wavelength-division multiplexing (WDM) to allow simultaneous transmission and reception on a single fiber. The optical module's internal circuitry ensures that the emitted light does not interfere with the received signal, maintaining clear distinction between the two directions .
Summary
An RRU optical module distinguishes between sending and receiving light by combining dedicated optical components (laser/LED for transmission, photodetector for reception) with signal processing and optical path separation. This design ensures reliable bidirectional communication between the RRU and the baseband unit over fiber optic links, supporting high-speed, low-latency wireless networks .
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How does an RRu optical module distinguish between receiving and
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