Proposal for photonic quantization with differential encoding using a phase modulator and delay-line interferometers

Chi, Hao; Li, Z.; Zhang, X.; Zheng, Shilie; Jin, Xiaofeng; Yao, Jianping

doi:10.1364/ol.36.001629

Cited by 23 publications

(18 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Actually, it is the most important application of an analog comparator in photonic ADC systems to digitize a train of optical pulses with varying amplitudes into two levels, irrespective of the ADCs are multi-bit or single-bit ADCs123456789101112131415161718. In our case, the optical pulse stream to be digitized is obtained through the most widely used electro-optic modulator (EOM) in photonic ADCs23456789. Figure 5 shows the results when our all-optical comparator operates in the discrete-time mode.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

All-optical analog comparator

Liu

et al. 2016

Sci Rep

View full text Add to dashboard Cite

An analog comparator is one of the core units in all-optical analog-to-digital conversion (AO-ADC) systems, which digitizes different amplitude levels into two levels of logical ‘1’ or ‘0’ by comparing with a defined decision threshold. Although various outstanding photonic ADC approaches have been reported, almost all of them necessitate an electrical comparator to carry out this binarization. The use of an electrical comparator is in contradiction to the aim of developing all-optical devices. In this work, we propose a new concept of an all-optical analog comparator and numerically demonstrate an implementation based on a quarter-wavelength-shifted distributed feedback laser diode (QWS DFB-LD) with multiple quantum well (MQW) structures. Our results show that the all-optical comparator is very well suited for true AO-ADCs, enabling the whole digital conversion from an analog optical signal (continuous-time signal or discrete pulse signal) to a binary representation totally in the optical domain. In particular, this all-optical analog comparator possesses a low threshold power (several mW), high extinction ratio (up to 40 dB), fast operation rate (of the order of tens of Gb/s) and a step-like transfer function.

show abstract

Section: Resultsmentioning

confidence: 99%

“…For instance, Mach-Zehnder modulators (MZMs) have been widely used to achieve photonic ADCs2345678 since Taylor firstly employed them for optical ADC9. The Sagnac interferometer or nonlinear optical loop mirror (NOLM) is another widely used configuration utilizing cross-phase modulation (XPM) in highly nonlinear fibers (HNLFs) for ADC10111213.…”

mentioning

confidence: 99%

All-optical analog comparator

Liu

et al. 2016

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The realization of photonic quantization with differential encoding is first proposed in [2], in which a phase modulator (PM) and an array of delay line interferometers (DLIs) are applied to the system as show in Fig. 1.…”

Section: Differentially-encoded Photonic Adc Using a Phase Modulator mentioning

confidence: 99%

Approaches for differentially-encoded photonic analog-to-digital conversion

Chen

Chi

Zhang

2011

10th International Conference on Optical Communications and Networks (ICOCN 2011)

View full text Add to dashboard Cite

show abstract

“…By properly adjusting the bias voltages of MZMs, the desired phase shifts of different transfer functions can be obtained. In order to reduce the required modulators and improve the system resolution, a digitization scheme using a single PM and an array of delay-line interferometers (DLIs) was proposed [18]. In [18], the differential signal instead of the original input signal is encoded.…”

Section: Introductionmentioning

confidence: 99%

Photonic Digitization With Differential Encoding Based on Orthogonal Vector Superposition

et al. 2019

View full text Add to dashboard Cite

In this paper a novel photonic digitization scheme with differential encoding based on orthogonal vector superposition (OVS) is proposed and demonstrated. A phase modulator (PM) and two delay-line interferometers (DLIs) with π/2 difference in bias phase are employed to generate two orthogonal modulated signals. By adjusting and combining the intensity of two orthogonal signals with an OVS module, the desired phase shifts among different transfer functions can be obtained. The proposed scheme can differentially encode the input signal with enhanced bit resolution. Compared with the existing photonic digitization schemes based on modulators, this scheme features its simple configuration, because only a single PM, two DLIs and an OVS module are required; moreover, since the desired phase shifts of transfer functions are realized by attenuating the signal intensities, the proposed scheme can effectively alleviate the problem of phase bias drift induced by modulators. Proof-of-concept experiments of 3-and 4-bit photonic digitization systems based on OVS are successfully carried out, which demonstrate the feasibility of the approach.

show abstract

Proposal for photonic quantization with differential encoding using a phase modulator and delay-line interferometers

Cited by 23 publications

References 13 publications

All-optical analog comparator

All-optical analog comparator

Approaches for differentially-encoded photonic analog-to-digital conversion

Photonic Digitization With Differential Encoding Based on Orthogonal Vector Superposition

Contact Info

Product

Resources

About