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

1989 ◽  
Vol 136 (4) ◽  
pp. 238 ◽  
Author(s):  
R.S. Fyath ◽  
A.J. McDonald ◽  
J.J. O'reilly
Keyword(s):  
Direct Detection ◽  
Optical Receivers ◽  
Power Penalty

Optical Soliton Transmission System

2015 ◽  
pp. 60-74
Keyword(s):  
System Performance ◽  
Direct Detection ◽  
Group Velocity Dispersion ◽  
Input Power ◽  
Optical Soliton ◽  
Power Penalty ◽  
Channel Input ◽  
Soliton Transmission System ◽  
Soliton Transmission ◽  
Channel Separation

Performance analysis is carried out to evaluate the effect of XPM on a Dispersion Managed (DM) 40Gb/s optical soliton transmission using direct detection, in the presence of Group Velocity Dispersion (GVD), Self-Phase Modulation (SPM), and Amplified Spontaneous Emission (ASE) in this chapter. It is found that for a distance of 2000 km, a power penalty of 1.9 dB is required to achieve a BER of 10-9 when XPM is taken into consideration. This power penalty increases with increasing neighbouring channel power and decreases with increasing channel separation. The system performance is also shown to be dependant on the system dispersion whereby the optimum dispersion is linked to the channel input power.

Performance Analysis of a Multiple Subcarrier Modulated FSO Communication System using Direct Detection Optical Receiver under the Effect of Weak Atmospheric Turbulence

2020 ◽  
Vol 41 (4) ◽  
pp. 453-461
Author(s):  
Bobby Barua ◽  
S. P. Majumder
Keyword(s):  
Atmospheric Turbulence ◽  
Direct Detection ◽  
Optical Receiver ◽  
Closed Form Expression ◽  
Free Space Optical ◽  
Power Penalty ◽  
Link Distance ◽  
Distance Data ◽  
Channel Analysis ◽  
Log Normal

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.

Crosstalk Limitations due to Intercore Coupling on the BER Performance of an Optical Communication System with Homogeneous Multi-core Fiber

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Afzal Hossain Hossain
Keyword(s):  
Refractive Index ◽  
Direct Detection ◽  
Communication Link ◽  
Coupling Coefficients ◽  
Relative Refractive Index ◽  
Power Penalty ◽  
Fiber Optic Communication ◽  
Index Contrast ◽  
Optic Communication ◽  
Ber Performance

AbstractThe effect of crosstalk due to inter-core coupling on the bit error rate (BER) performance of a fiber optic communication link with a homogeneous multi-core optical fiber (MCF) and a direct detection receiver with optical preamplifier is analytically evaluated and presented in this paper. Coupling coefficients due to inter-core coupling in a 7-core MCF is evaluated numerically with as a function of core-to-core distance (pitch) and relative refractive index contrast. Coupling length is determined against various index contrasts and at different core pitches. Crosstalk power, Signal to Crosstalk plus Noise Ratio (SCNR), BER and power penalty at any output core with light launched into other core of a 7-core MCF are determined analytically. The results show that there is mentionable deterioration in BER performance due to coupling induced crosstalk, and system suffers distinct power penalty at a given BER. For example, power penalty at BER of 10e-9 is found to be 4.0 dB and 4.3 dB for a MCF link of 10 km corresponding to relative refractive index difference of 0.0036 and 0.0030, respectively, for a pitch value of 30 µm and core radius of 4.5 µm.

Effect of Pointing Error on the BER Performance of an Optical CDMA FSO Link with SIK Receiver

2017 ◽  
Vol 38 (4) ◽  
Author(s):  
A. K. M. Nazrul Islam ◽  
S. P. Majumder
Keyword(s):  
Bit Error Rate ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Direct Detection ◽  
Optical Cdma ◽  
Free Space Optical ◽  
Power Penalty ◽  
Pointing Error ◽  
Multi Access ◽  
Code Division Multiple

AbstractAn analytical approach is presented for an optical code division multiple access (OCDMA) system over free space optical (FSO) channel considering the effect of pointing error between the transmitter and the receiver. Analysis is carried out with an optical sequence inverse keying (SIK) correlator receiver with intensity modulation and direct detection (IM/DD) to find the bit error rate (BER) with pointing error. The results are evaluated numerically in terms of signal-to-noise plus multi-access interference (MAI) ratio, BER and power penalty due to pointing error. It is noticed that the OCDMA FSO system is highly affected by pointing error with significant power penalty at a BER of 10

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