scholarly journals Frequency-Octupling Millimeter-Wave Optical Vector Signal Generation via an I/Q Modulator-Based Sagnac Loop

Symmetry ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 84
Author(s):  
Zhixian Yang ◽  
Kun Qu ◽  
Xiang Liu
Keyword(s):  
Millimeter Wave ◽  
Wave Vector ◽  
Chromatic Dispersion ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Optical Fields ◽  
Wave Nature ◽  
Shift Keying ◽  
Frequency Octupling ◽  
Vector Signal

A new method for generating frequency-octupling millimeter-wave (mm-wave) vector signals in optical fields via a Sagnac loop is proposed. In this scheme, two orthogonally polarized fourth order sidebands can be obtained through an integrated dual-polarization quadrature phase shift keying (DP-QPSK) modulator. The two optical sidebands are sent into an I/Q modulator-based Sagnac loop. The I/Q modulator is modulated by a 16QAM baseband signal. In the Sagnac loop, one of the sidebands is modulated by the baseband vector signal along one direction, and the other sideband is unmodulated along the opposite direction because the I/Q modulator has the traveling-wave nature. Thanks to this modulation property and the symmetrical structure of the Sagnac loop, a frequency-octupling mm-wave vector signal that is free from interband beating and fiber chromatic dispersion interference can be generated by the photodetector (PD). After simulating a 20 km single-mode fiber (SMF) transmission, the generated frequency-octupling vector signal was good in function.

INFLUENCE OF EXTINCTION RATIO ON THE PERFORMANCE OF RZ-ODPASK MODULATION FORMAT

2009 ◽  
Vol 23 (11) ◽  
pp. 2479-2489
Author(s):  
XIAOJUN LI ◽  
AIJUN WEN ◽  
ZENGJI LIU ◽  
TAO SHANG
Keyword(s):  
Single Channel ◽  
Chromatic Dispersion ◽  
Extinction Ratio ◽  
Optical Fields ◽  
Analytical Methodology ◽  
Modulation Formats ◽  
Modulation Format ◽  
Fiber Nonlinearity ◽  
Shift Keying ◽  
Phase Amplitude

The influence of extinction ratio (ER) on the performance of 120 Gbps return-to-zero octal differential phase-amplitude-shift keying (RZ-ODPASK) modulation format in single-channel transmission is investigated. Based on the modulation and demodulation schemes, the structures of RZ-ODPASK transmitter and receiver are presented; and expressions for the output optical fields and electrical currents of amplitude and phase tributaries are analytically acquired. As ER is a tradeoff for good performance of the two tributaries, the optimal ER for back-to-back configuration is theoretically derived as 2.32 dB for the first time, which is verified by simulation. Then the tolerances to residual chromatic dispersion (CD) and fiber nonlinearity of RZ-ODPASK transmission are numerically studied, respectively. The results indicate that phase tributary is more robust against both dispersion and nonlinearity impairment than the amplitude tributary. To balance the performance of the two tributaries, curves of the optimal ER values with the change of residual CD and fiber nonlinearity are also obtained, respectively. The results can be useful for the design of RZ-ODPASK systems; in the meantime, the analytical methodology described in this paper is applicable to other multilevel RZ-DPASK modulation formats.

An optical millimeter-wave vector signal generation scheme by frequency quadrupling

2012 ◽  
Vol 285 (24) ◽  
pp. 5429-5432 ◽  
Author(s):  
Mingan Li ◽  
Aijun Wen ◽  
Yang Chen ◽  
Lei Shang ◽  
Lei Yang ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Wave Vector ◽  
Signal Generation ◽  
Vector Signal

40 Gbps Downstream Transmission Using DQPSK and 20 Gbps Upstream Transmission Using IRZ Modulation in Full-Duplex WDM-PON

2019 ◽  
Vol 40 (3) ◽  
pp. 255-260
Author(s):  
Binoy Das ◽  
Rahul Mukherjee ◽  
Gour Chandra Mandal ◽  
Ardhendu Sekhar Patra
Keyword(s):  
Bit Error Rate ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Full Duplex ◽  
Phase Shift Keying ◽  
Downlink Transmission ◽  
Quadrature Phase Shift Keying ◽  
Quadrature Phase ◽  
Shift Keying ◽  
Wdm Pon

Abstract A full duplex WDM-PON system is designed and demonstrated based on carrier reusing scheme and by employing differential quadrature phase shift keying (DQPSK) modulation in downlink and inverse return-to-zero modulation in the uplink to transmit 40 Gbps and 20Gbps data-rate respectively. Three Mach-Zehnder modulators are used sequentially to realize the 67 % carrier suppressed return to zero (CS-RZ) DQPSK modulation in the downlink transmission. Very low bit error rate values @10‒9 and clear eye-diagrams are observed over a 40 km single-mode-fiber transmission in our proposed full-duplex configuration.

scholarly journals Broad-Band HBT BPSK and IQ Modulator MMICs and Millimeter-Wave Vector Signal Characterization

2004 ◽  
Vol 52 (3) ◽  
pp. 908-919 ◽  
Author(s):  
H.-Y. Chang ◽  
T.-W. Huang ◽  
H. Wang ◽  
Y.-C. Wang ◽  
P.-C. Chao ◽  
...  
Keyword(s):  
Millimeter Wave ◽  
Wave Vector ◽  
Broad Band ◽  
Iq Modulator ◽  
Signal Characterization ◽  
Vector Signal

scholarly journals Multi-Twin-SSB Modulation with Direct Detection Based on Kramers–Kronig Scheme for Long-Reach PON Downstream

2019 ◽  
Vol 9 (4) ◽  
pp. 748 ◽  
Author(s):  
Xiang Gao ◽  
Yuancheng Cai ◽  
Bo Xu ◽  
Xiaoling Zhang ◽  
Kun Qiu
Keyword(s):  
Optical Networks ◽  
Forward Error Correction ◽  
Direct Detection ◽  
Chromatic Dispersion ◽  
Optical Network ◽  
Single Mode ◽  
System Optimization ◽  
Single Mode Fiber ◽  
High Data ◽  
Multi Band

As the demand for high data volumes keeps increasing in optical access networks, transmission capacities and distance are becoming bottlenecks for passive optical networks (PONs). To solve this problem, a novel scheme based on multi-twin single sideband (SSB) modulation with direct detection is proposed and investigated in this paper. At the central office, two SSB signals are generated simultaneously with the same digital-to-analog converters (DACs). The twin-SSB signal is not only robust against frequency selected power fading introduced by chromatic dispersion (CD), but also improves the spectral efficiency (SE). By combining a twin-SSB technique with multi-band carrier-less amplitude/phase modulation (multi-CAP), different optical network units (ONUs) can be supported by flexible multi-band allocation based on software-reconfigurable optical transceivers. The Kramers–Kronig (KK) scheme is adopted on the ONU side to effectively mitigate the signal–signal beat interference (SSBI) induced by the square-law detection. The proposed system is extensively studied and validated with four sub-bands using 50 Gbps 16 quadrature amplitude modulation (QAM) modulation for each sub-band using numerical simulations. Digital pre-equalization is introduced at the transmitter-side to balance the performance of different ONUs. After system optimization, a bit error rate (BER) threshold for hard decision forward error correction (HD-FEC) code with 7% redundancy ratio (BER = 3.8 × 10−3) can be reached for all ONUs over 50-km standard single-mode fiber.

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