Phase-shift optical quantization receiver based on balance detection

Abstract

The invention discloses a phase-shift optical quantization receiver based on balance detection, belonging to the technical field of optical analog-digital converters. In the balance detection, signals to be judged and output by every quantization channel of a full optical quantizer are a group of difference optical signals of which the amplitudes are complementary; and after the balance receiver is used for receiving the difference optical signals, the difference signals are amplified into a digital signal level by the amplitude limiting of a transimpedance amplifier. The invention can eliminate influence of common-mode noise in a system and effectively reduce judgment logic errors caused by luminous power fluctuation without setting a judgment threshold, thereby eliminating the influenceof the threshold judgment errors, increasing the sensitivity and the tolerance to noise of the receiver, and realizing higher threshold judgment accuracy.

Description

technical field [0001] The invention belongs to the technical field of information optoelectronics, in particular to an optical analog-to-digital converter. Background technique [0002] The core function of the quantization receiver is to realize accurate threshold judgment, so as to realize the all-optical quantization output of the optical analog-to-digital converter. Therefore, finding a threshold decision technique suitable for the phase-shift optical quantization scheme is the key to the design of the phase-shift optical quantization receiver. [0003] After sampling, quantization and encoding, the optical signal of each quantization channel will finally enter the optical quantization receiver. The function of the optical quantization receiver is to first compare the input signal with the decision threshold through logical judgment, the output above the threshold is logic "1", and the output below the threshold is logic "0", and the encoded optical signal is converted...

AI Technical Summary

Problems solved by technology

This scheme first requires a high-speed electrical comparator, and the processing rate is limited to a certain extent.

Threshold level errors in comparators have a severe impact on quantization accuracy

Images