V921YLF

Series:	--
Packaging:	Tray
Part Status:	Obsolete
Type:	Receiver
Protocol:	--
Number of Drivers/Receivers:	0/2
Duplex:	--
Data Rate:	--
Voltage - Supply:	1.8V
Operating Temperature:	--
Mounting Type:	Surface Mount
Package / Case:	144-TQFP Exposed Pad
Supplier Device Package:	144-TQFP (20x20)
Base Part Number:	V921

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V921YLF Application Field and Working Principle

V921YLF is an optical receiver in the field of Interface-Drivers, Receivers, Transceivers. It adopts super high linearity of the amplifier, integrates small signal amplifying, AGC, flux regulation, waveform shaping and other functions in one, and operates in the wavelength range of 850nm and 1310nm. It is specially designed for optical fiber communication points-to-points and broadband access of continuous optical encryption system. V921YLF has a wide range of applications, such as long distance optical fiber communication, circular optical fiber communication, cross-network core optical fiber ring and other communication systems; optical redistribution and optical submarine cables, etc.

Working Principle:

The working principle of V921YLF optical receiver is mainly concentrated in two aspects. Firstly, it uses high-sensitivity photoelectric detection to transform the optical signal into electrical signal according to the characteristics of photoelectric transformation. Secondly, the electrical signal is processed by AGC (Automatic Gain Control) circuit and waveform shaping circuit to restore the optical signal as original as possible and complete the mission of optical to electrical transformation. At the same time, a flux regulating circuit is employed to control the gain of the amplifier, so that the output signal strength is consistent and stable, so that the signal to noise ratio is improved. The structure of V921YLF optical receiver consists of three parts: the focal lens, the photoelectric detector, and the signal processing circuit to achieve full signal conversion from optical energy to electrical energy.

Focal lens

The focal lens is a glass device used to concentrate the incident optical signal on the photoelectric detector. The core of the lens is a parabolic mirror or a quadric mirror, which can concentrate the signal received by the lens onto the light-sensitive detector of the photoelectric detector. A ruler scale is superimposed on the surface of the lens to measure the incident light intensity point by point and thus determine the variation of the input optical signal waveform. The lens is usually made with dual-wavelength design to make sure the receiver can receive signals with wavelength of 850nm and 1310nm.

Photoelectric Detector

The photoelectric detector is the main component of the V921YLF receiver. The core of the photoelectric detector is a semiconductor-level optoelectronic device. Its sensitivity is very high and its detectivity can reach more than 95dB/ micro-watt. The optical signal is converted to electrical signal through the photoelectric effect and the electric signal is output from the detector in the form of a current. The photoelectric detector will also provide temperature compensation to preserve the stability of the device.

Signal Processing Circuit

The signal processing circuit is used to process the optical signal received by the photoelectric detector on the front end, which is mainly composed of AGC (automatic gain control) circuit and waveform shaping circuit.AGC circuit is used to ensure the stability of the output signal and strengthens the weak signal while avoiding the over-amplification of the strong signal. It consists of two parts: amplifying gain control and dynamic gain control. The amplifying gain regulation ensures that the weak signal can be amplified and the strong signal can not be amplified too much so as to improve the signal to noise ratio. The dynamic gain control regulates the long-term stability of the receiver to ensure the stability and dynamic range of the receivers output.The waveform shaping circuit mainly acts on the linearity and waveform requirement of the output signal. The waveform distortion caused by the nonlinearity of the amplifier system is corrected by the waveform shaping circuit. The waveform shaping circuit passes the signal into a comparator circuit and compares it with a reference signal. It then produces an output voltage taking into account of the comparison result and the amplitude of the signal entering the comparator circuit in order to restore the waveform into an ideal (sinusoidal) one.

Conclusion

To sum up, V921YLF optical receiver, as an important part of interface-Drivers, Receivers, Transceivers, combines the sensitivity of photoelectric detection with the AGC and waveform shaping of the circuit, which completes the transformation from optical signal to electrical signal. At the same time, the lens, the photoelectric detector and the signal processing circuit are also indispensable components in the whole receiving circuit. The receiver not only performs its own mission well, but also has good performances such as wide band, high sensitivity and high linearity.

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