A 3.125Gbit/s Parallel Optical Receiver in 0.13-{mu} CMOS with Direct Crosstalk Power Penalty Measurement Capability

AbstractIn this paper, an analytical approach is presented to evaluate the bit error rate (BER) of a free space optical (FSO) link with radio frequency (RF) multiple subcarrier modulation, taking into account the effect of weak atmospheric turbulence considering a direct detection optical receiver followed by RF synchronous demodulator for each sub-channel. Analysis is carried out to find a closed-form expression for conditional BER at the output of the RF demodulators conditioned on a given value of atmospheric turbulence-induced fading and intermodulation distortion (IMD). The average BER for each sub-channel is then found by averaging the conditional BER over the probability density function of the atmospheric turbulence modeled as log-normal distribution. Degradations of BER due to atmospheric turbulence are evaluated for several values of system parameters like number of RF subcarrier, turbulence variance, link distance, data rate and power penalty suffered by the system due to atmospheric turbulence and IMD. For a given system bandwidth, it is found that the maximum power penalty occurs when the subcarrier number is around four and the performance gradually improves with increase in the number of subcarrier. For example, at a system bandwidth of 20 GHz with subcarrier number 4, the power penalty at a BER of 10–9 is found to be 30 dB for a link distance of 3.6 km, whereas the power penalty reduces to 13 dB when the number of subcarrier is increased to 32.

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BER Performance Analysis of an Orthogonal FDM Free Space Optical Communication System with Homodyne Optical Receiver over Turbulent Atmospheric Channel

Journal of Optical Communications ◽

10.1515/joc-2019-0221 ◽

2019 ◽

Vol 0 (0) ◽

Author(s):

Bobby Barua ◽

S. P. Majumder

Keyword(s):

Atmospheric Turbulence ◽

Free Space ◽

Communication Systems ◽

Local Oscillator ◽

Optical Receiver ◽

Phase Changes ◽

Free Space Optical ◽

Power Penalty ◽

Link Distance ◽

Space Optical Communication

AbstractAtmospheric turbulence induced fading may severely impair free-space optical (FSO) communication systems, affecting the quality of the propagated laser beam and lead to significant performance degradation. Recent research works reveal that performance can be improved by using orthogonal FDM. In this paper, an analytical approach is presented to evaluate the bit error rate performance of an OFDM FSO link with optical intensity modulation and coherent homodyne receiver taking into consideration the effect of strong atmospheric turbulence. The turbulence effect is modeled as gamma-gamma distribution and the performance results are evaluated in terms of average CNR and BER. Power penalty suffered by the system due to the effect of turbulence at a given BER is evaluated for several system parameters viz. link distance, turbulence parameter, local oscillator power etc. It is noticed that effect of turbulence can be significantly reduced by increasing the number of OFDM subcarrier. For example, power penalty for BER of 10–9 at a link distance of 3,600 m is 6 dB when number of subcarrier is 4 and can be reduced to 0.5 dB by increasing the number of subcarrier to 64. In addition, by utilizing coherent optical receiver and synchronous demodulation at the receiving end, we have introduced local oscillator (LO) for both Optical and RF state which have ability to track the signal’s phase changes over time relative to the LO’s phase and helps the system to remain stable.

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Sensitivity and power penalty considerations for laser preamplified direct detection optical receivers

IEE Proceedings J Optoelectronics ◽

10.1049/ip-j.1989.0039 ◽

1989 ◽

Vol 136 (4) ◽

pp. 238 ◽

Cited By ~ 1

Author(s):

R.S. Fyath ◽

A.J. McDonald ◽

J.J. O'reilly

Keyword(s):

Direct Detection ◽

Optical Receivers ◽

Power Penalty

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A statistical theory of PMD-induced power penalty

31st European Conference on Optical Communications (ECOC 2005) ◽

10.1049/cp:20050506 ◽

2005 ◽

Cited By ~ 2

Author(s):

C. Antonelli

Keyword(s):

Statistical Theory ◽

Power Penalty

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Effect of external cavity semiconductor laser phase noise on a DPSK heterodyne optical receiver

Electronics Letters ◽

10.1049/el:19880463 ◽

1988 ◽

Vol 24 (11) ◽

pp. 684-685

Author(s):

S. Betti ◽

G. de Marchis ◽

E. Iannone ◽

A. Martellucci

Keyword(s):

Phase Noise ◽

Semiconductor Laser ◽

External Cavity ◽

Optical Receiver

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Impact of Pointing Error on the BER Performance of an OFDM Optical Wireless Communication Link over Turbulent Condition

Journal of Optical Communications ◽

10.1515/joc-2020-0021 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Bobby Barua ◽

S. P. Majumder

Keyword(s):

Noise Analysis ◽

Data Rate ◽

Channel Noise ◽

Communication Link ◽

Optical Wireless ◽

Power Penalty ◽

Major Power ◽

Pointing Error ◽

Turbulent Condition ◽

Ber Performance

AbstractAn analytical approach is developed in this paper to evaluate the bit error rate (BER) performance of an optical wireless (OW) communication system with multiplexing of the RF orthogonal frequency division (OFDM) over turbulent condition taking into account the effect of pointing error. The received signal is detected through direct detection receiver followed by RF synchronous demodulation including the effect of OW channel and different form of noises such as receiver thermal noise, background channel noise and photo detector shot noise. Analysis is developed for an OFDM system over the OW channel, taking into account the effect of pointing error between the transmitter and the receiver in turbulent condition and the analysis reveals that the OFDM OW system is less affected by pointing error with deference to the major power penalty at BER performance. For instance, power penalty at BER 10−9 is found to be 3 dB for 256 OFDM subcarriers with 9 millidegree displacement angle at a data rate of 10 Gbps under turbulent condition. It is found that the system is more influenced by the atmospheric turbulence at a higher data rate.

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