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Frontiers of Optoelectronics

ISSN 2095-2759

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Front. Optoelectron.    2021, Vol. 14 Issue (3) : 365-373    https://doi.org/10.1007/s12200-020-0947-9
RESEARCH ARTICLE
All-optical pseudo noise sequence generator using a micro-ring resonator
Rajiv KUMAR1(), Ajay KUMAR2, Poonam SINGH3, Niranjan KUMAR4
1. Deptartment of Electronics and Communication Engineering, Indian Institute of Information Technology (IIIT) Ranchi, Ranchi 834010, India
2. Department of Electronics and Communication Engineering, National Institute of Technology (NIT) Jamshedpur, Jamshedpur 831014, India
3. Department of Electronics and Communication Engineering, National Institute of Technology (NIT) Rourkela, Rourkela 769008, India
4. Department of Electrical Engineering, National Institute of Technology (NIT) Jamshedpur, Jamshedpur 831014, India
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Abstract

A scheme for the generation of a pseudo noise (PN) sequence in the optical domain is proposed. The cascaded units of micro-ring resonator (MRR)-based D flip-flop are used to design the device. D flip-flops consist of a single MRR and share the same optical pump signal. Numerical analysis is performed, and simulated results are discussed. The proposed device can be used as a building block for optical computing and for creating an information processing system.
Keywords all-optical      D flip-flop      micro-ring resonator (MRR)      optical communication      pseudo noise (PN) sequence     
Corresponding Author(s): Rajiv KUMAR   
Just Accepted Date: 27 May 2020   Online First Date: 23 June 2020    Issue Date: 30 September 2021
 Cite this article:   
Rajiv KUMAR,Ajay KUMAR,Poonam SINGH, et al. All-optical pseudo noise sequence generator using a micro-ring resonator[J]. Front. Optoelectron., 2021, 14(3): 365-373.
 URL:  
https://academic.hep.com.cn/foe/EN/10.1007/s12200-020-0947-9
https://academic.hep.com.cn/foe/EN/Y2021/V14/I3/365
Fig.1  Single MRR
Fig.2  (a) Switching phenomenon of MRR. (b) Normalized output power at through and drop ports at the wavelength of 1550 nm. (c) Variation in the phase shift with the average amount of pump power inside the ring resonator
clock D Qn+1
0 X Qn
1 0 0
1 1 1
Tab.1  Truth table of D flip-flop
Fig.3  All-optical clocked D flip-flop using the MRR structure
Fig.4  Simulation result of the D flip-flop
Fig.5  Block diagram of the 4-bit PN sequence generator
clock Q3 Q2 Q1 Q0
0 0 0 0 1
1 1 0 0 0
2 0 1 0 0
3 0 0 1 0
4 1 0 0 1
5 1 1 0 0
6 0 1 1 0
7 1 0 1 1
8 0 1 0 1
9 1 0 1 0
10 1 1 0 1
11 1 1 1 0
12 1 1 1 1
13 0 1 1 1
14 0 0 1 1
15 0 0 0 1
Tab.2  Truth table of 4-bit PN sequence generator where the initial sequence is Q3Q2Q1Q0→0001
Fig.6  Layout diagram of all-optical 4-bit PN sequence generator
Fig.7  Simulated results describe the output state for the clock pulses 1 to 15. (a) Output state at the 0th clock pulse Q3Q2Q1Q0→'0001'. (b) Output state at the 1st clock pulse Q3Q2Q1Q0→' 1000'. (c) Output state at the 2nd clock pulse Q3Q2Q1Q0→'0100'. (d) Output state at the 3rd clock pulse Q3Q2Q1Q0→' 0010'. (e) Output state at the 4th clock pulse Q3Q2Q1Q0→'1001'.(f) Output state at the 5th clock pulseQ3Q2Q1Q0→' 1100'. (g) Output state at the 6th clock pulse Q3Q2Q1Q0→'0110'.(h) Output state at the 7th clock pulse Q3 Q2Q 1 Q0→'1011'.(i) Output state at the 8th clock pulseQ3Q2Q1Q0→' 0101'. (j) Output state at the 9th clock pulse Q3Q2Q1Q0→'1010'.(k) Output state at the 10th clock pulse Q3Q2Q1Q0→' 1101'. (l) Output state at the 11th clock pulse Q3Q2Q1Q0→'1110'. (m) Output state at the 12th clock pulse Q3Q2Q1Q0→' 1111'. (n) Output state at the 13th clock pulse Q3Q2Q1Q0→'0111'. (o) Output state at the 14th clock pulse Q3Q2Q1Q0→' 0011'. (p) Output state at the 15th clock pulse Q3Q2Q1Q0→'0001'
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