Realization of high capacity transmission in fiber optic communication systems using Absolute Polar Duty Cycle Division Multiplexing (AP-DCDM) technique (original) (raw)
Related papers
30Gb/s Absolute Polar Duty Cycle Division Multiplexing In Dispersion Uncompensated Optical Systems
Telecommunication Technologies 2008 and 2008 2nd Malaysia Conference on Photonics. NCTT-MCP 2008. 6th National Conference on, 2008
In this study the author has modeled and characterizes the performance of 3X10 Gbp/s Absolute Polar Duty Cycle Division (APDCDM) Multiplexing in dispersive environments at 1550 nm. APDCDM technique is examined, with comparison to nonreturn- to-zero (NRZ) and return-to-zero (RZ) Time Division Multiplexing. In this paper three channel operating at the same speed of 10 Gbps are multiplexed in electrical domain. The experimental simulation results show that the receiver sensitivity of all users in APDCDM system is similar to that of RZ- TDM and 3 dB better than NRZ-TDM. The proposed system offer reduced dispersion sensitivity; this suggests advantages for APDCDM in optical multiplexing systems. It was also showed that APDCDM can support higher bit rate than TDM and also, it is less sensitive to the chromatic dispersion effect.
Telecommunication Technologies 2008 and 2008 2nd Malaysia Conference on Photonics. NCTT-MCP 2008. 6th National Conference on, 2008
In this paper, duty cycle division multiplexing (DCDM) is proposed as an alternative multiplexing technique. It can be applied in any communication systems, although the focus in this paper is in optical fiber communications. In this paper, we examine 3 channels each operating at 10 Gbps modulation rate over a single optical carrier. The performance comparison is made against 30 Gbps RZ transmitted pulses, time domain multiplexed (TDM). The results show that at a fixed transmission power, DCDM can support longer distance than that with RZ TDM technique. Also, the results show that RZ-TDM pulses require 35.5 dB more SNR to support the same distance as that for DCDM.
2008
A duty cycle division multiplexing (DCDM) is proposed as an alternative multiplexing technique. It can be applied in either wired or wireless communication systems, although the focus in this paper is in optical fiber communications. The channel multiplexing and demultiplexing is performed electrically at single user bit rate which is very economic. In this paper, we examine 3 channels each operating at 10 Gb/s over a single optical carrier. The performance comparison is made against return-to-zero (RZ) transmitted pulses. Back-to-back receiver sensitivity and required optical signal-to-noise ratio (OSNR) of this system are examined and compared with 10 Gb/s RZ pulses. Effect of the chromatic dispersion is tested for DCDM channels and compared with 30 Gb/s RZ coding at the same transmission power. Also, the launched power of these two techniques is measured against system dispersion at BER of 10-9. The results show that, DCDM can support higher amount of chromatic dispersion than that RZ technique. In the end, receiver sensitivity and OSNR of 3-channel DCDM is tested at different bit rate of 2.5, 10, 25 and 40 Gb/s. A receiver sensitivity and OSNR of -16.8 dBm and 34.6 dB is required for the worst DCDM user when the system running at 3 times 40 Gb/s respectively.
Iet Optoelectronics, 2009
The effect of self-phase modulation (SPM) on 40 Gb/s absolute polar duty cycle division multiplexing (AP-DCDM) is investigated and reported. The study includes the influence of launched power, number of channels and dispersion compensation method. Dispersion post-compensation and combination of dispersion pre-and post-compensation are used to manage the transmission links. At high powers, SPM degrades the pulse recompression process and provides an upper bound on the AP-DCDM transmitted pulse energy. It is demonstrated that the 40 Gb/s AP-DCDM system shows a 4.1 dB improvement and less than 1 dB penalty in terms of SPM tolerance in comparison to 40 Gb/s 4-ary and on -off-keying (OOK) systems, respectively. The SPM effect is stronger in the 100% post-compensated link than that in the combination of pre-and post-compensated links. Dispersion pre-compensation of 18 -22% is found as the optimum range of pre-compensation ratio for AP-DCDM system, which makes optimisation of the launched power possible.
Telecommunication Technologies 2008 and 2008 2nd Malaysia Conference on Photonics. NCTT-MCP 2008. 6th National Conference on, 2008
"A new multiplexing technique based on duty cycle division is proposed, thus the name Duty Cycle Division Multiplexing (DCDM). DCDM can be applied in both electrical and optical domains, for wired and wireless systems. The new technique allows for more efficient use of time slots as well as the spectrum, taking advantage of both the conventional TDM and FDM. In this paper, three channels operating at the same speed of 10 Gbps per channel are multiplexed in the electrical domain. The performance comparison is made against 3x10 Gbps TDM, and the experimental simulation results show that the DCDM system can support higher bit rate than TDM and also, it is less sensitive to the chromatic dispersion effect."
Photonics (ICP), 2010 International Conference on, 2010
The effect of guard band (GB) on the performance of 40 Gb/s Absolute Polar Duty Cycle Division Multiplexing (APDCDM) is investigated and reported. It is demonstrated that the spectral width occupied by 40 Gb/s AP-DCDM with GB is 100 GHz (with minimum spectral efficiency of 0.4 b/s/Hz) whereas, this value can be reduced to around 80 GHz for AP-DCDM without GB (with minimum spectral efficiency of 0.5 b/s/Hz). In addition to better spectral efficiency, this amount of saving in the spectral width leads to ~ 60 ps/nm improvement in chromatic dispersion tolerance.
IEEE Photonics Technology Letters, 2004
We have investigated transmission of 14 40 Gb/s dense wavelength-division-multiplexing channels with 20-GHz spacing over 4 100 km of SMF-28 fiber. A spectral efficiency of 2 b/s/Hz was demonstrated by 4-b (8-state) per-symbol coding using return-to-zero differential quadrature phase-shift keying (RZ-DQPSK) and polarization multiplexing using polarization bit interleaving. All 12.5-Gsymbols/s transmitted channels included 25% overhead bandwidth reserved for forward-error correction (FEC) and showed uncorrected bit-error rate below the FEC threshold required for error-free operation. Demodulation of the RZ-DQPSK signal at the receiver was achieved using a fiber-based asymmetric Mach-Zehnder interferometer as well as a packaged integrated lithium niobate optical 90 hybrid.
IEEE Photonics …, 2004
We have investigated transmission of 14 40 Gb/s dense wavelength-division-multiplexing channels with 20-GHz spacing over 4 100 km of SMF-28 fiber. A spectral efficiency of 2 b/s/Hz was demonstrated by 4-b (8-state) per-symbol coding using return-to-zero differential quadrature phase-shift keying (RZ-DQPSK) and polarization multiplexing using polarization bit interleaving. All 12.5-Gsymbols/s transmitted channels included 25% overhead bandwidth reserved for forward-error correction (FEC) and showed uncorrected bit-error rate below the FEC threshold required for error-free operation. Demodulation of the RZ-DQPSK signal at the receiver was achieved using a fiber-based asymmetric Mach-Zehnder interferometer as well as a packaged integrated lithium niobate optical 90 hybrid.
Electronic Design, 2008. ICED 2008. International Conference on, 2008
In order to explore the potential of optical multilevel signaling for high speed optical fiber networks, an absolute polar duty cycle division multiplexing (AP-DCDM) is demonstrated. Three users, each with the data rate of 10 Gb/s were successfully multiplexed and transmitted over a single WDM channel, which can offer a possible transmission rate of 30 Gb/s per WDM channel. The performance of AP-DCDM technique is examined, with comparison to 30 Gb/s Time Division Multiplexing (TDM) . Back-to-back receiver sensitivity of -29.2 dBm with OSNR of 22.5 dB was achieved for the worst user, together with the chromatic dispersion tolerance ranging from 207 ps/nm to 276 ps/nm. A comparison with conventional TDM technique shows a clear advantage of the proposed AP-DCDM technique.
A Multiplexing Technique for Improving Dispersion Tolerance in Optical Communication Systems
2009
We propose a multiplexing technique that uses different Polar Return-to-Zero duty cycles to differentiate the channels for enhancing dispersion limited transmission in high speed fiber optic communications. It is demonstrated that the spectral width occupied by 30 Gb/s TDM is 120 GHz whereas, this value can be reduced to around 80 GHz and 70 GHz for 30 Gb/s TDM over 3 and 6 channels of the proposed system respectively. By increasing the number of channels at the same aggregated bitrate, the spectral width of this technique is reduced which leads to better tolerance to chromatic dispersion. Comparison against other techniques such as M-ary-RZ and M-ary-NRZ shows clear advantage of proposed technique