25.4-cm Optical Receiver Performance

9301-005

 

Performance for the 10" (25.4 cm) Meade LX200 receiving telescope, and an ETI transmitter around a solar-type star at 10 light years.
 

Mean Power

Peak Power Pulse Duration M-ary PPM Bits Per Pulse Data Rate bps Peak EIRP W Mag Peak Signal dBW Photons Per Pulse Post-Detection SNR, dB
1 Hz 1 kHz 1 MHz 1 GHz
a 1 kW 1 kW NA NA NA NA 2.3 X 1018 +23 -188 NA -29 -59 -89 -119
b 1 MW 1 MW NA NA NA NA 2.3 X 1021 +15 -158 NA 20 -10 -40 -80
c 1 GW 1 GW NA NA NA NA 2.3 X 1024 +8 -128 NA 51 21 -9 -39
d 1 MW 103 TW 1 ns NA 1 1 2.3 X 1030 NA -68 4.8 X 1002 IB IB IB 24
e 1 GW 106 TW 1 ns NA 1 1 2.3 X 1033 NA -38 4.8 X 1005 IB IB IB 54
f 1 GW 2 GW 1 ns 2 1 500 M 4.6 X 1024 NA -125 9.5 X 10-4 IB IB IB -33
g 1 GW 8 GW 1 ns 8 3 380 M 1.8 X 1025 NA -119 3.8 X 10-3 IB IB IB -27
h 1 GW 128 GW 1 ns 128 7 55 M 2.9 X 1026 NA -107 6.1 X 10-2 IB IB IB -15
i 1 GW 1 TW 1 ns 1024 10 10 M 2.3 X 1027 NA -98 4.9 X 10-1 IB IB IB -6
j 1 GW 8 TW 1 ns 8192 13 1.6 M 1.9 X 1028 NA -89 3.9 X 1000 IB IB IB 3
k 1 MW 52 GW 1 ns 524288 19 36 k 1.2 X 1027 NA -101 2.5 X 10-1 IB IB IB -9
l 1 GW 524 TW 1 ns 524288 19 36 k 1.2 X 1030 NA -71 2.5 X 1002 IB IB IB 21

 

Wavelength = 656 nm
ETI Transmitting (Uplink) Telescope Diameter = 10.0 m
Earth Receiving Station (Downlink) Telescope Diameter = 25.4 cm
Atmospheric Transmission = 0.40
Telescope Efficiency = 0.70
Monochromator Efficiency = 0.50
Quantum Efficiency = 0.50
NEP For Incoherent Receiver 10-4 pW/Hz
Dark Current < 3.2 X 10-6 pA (< 20 cps or 2 X 10-8 counts/ns)
Fraunhofer Suppression = 0 dB
CW Optical Bandwidth = 100 GHz (0.14 nm), Pulse Optical Bandwidth >> 100 GHz.
Unpolarized Detected Stellar Background -144 dBW = 4.0 X 10-15 W = 1.3 X 104 photons/s = 1.3 X 10-5 photons/ns (6.6 X 10-4 counts/ns).
Solar EIRP = 3.9 X 1026 W

 

Shaded areas denote undetectable signals, i.e., negative SNRs or insufficient bandwidth (IB).
Results assume that star and transmitter are not separately resolved.
For the digital modulation systems, the pulse SNR for Poisson counting is the photon detection rate per pulse.
For pulsed SNRs > 20 dB, the Bit Error Rate (BER) < 10-8.

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