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10-m Optical Receiver Performance

9301-004

 

Performance for a 10-meter aperture 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 -157 NA -22 -8 -38 -68
b 1 MW 1 MW NA NA NA NA 2.3 X 1021 +15 -126 NA 53 23 -8 -38
c 1 GW 1 GW NA NA NA NA 2.3 X 1024 +8 -96 NA 83 53 23 -7
d 1 MW 103 TW 1 ns NA 1 1 2.3 X 1030 NA -36 7.4 X 105 IB IB IB 56
e 1 GW 106 TW 1 ns NA 1 1 2.3 X 1033 NA -6 7.4 X 108 IB IB IB 86
f 1 GW 2 GW 1 ns 2 1 500 M 4.6 X 1024 NA -93 1.5 X 100 IB IB IB -1
g 1 GW 8 GW 1 ns 8 3 380 M 1.8 X 1025 NA -87 5.9 X 100 IB IB IB 5
h 1 GW 128 GW 1 ns 128 7 55 M 2.9 X 1026 NA -75 9.5 X 101 IB IB IB 17
i 1 GW 1 TW 1 ns 1024 10 10 M 2.3 X 1027 NA -66 7.6 X 102 IB IB IB 26
j 1 GW 8 TW 1 ns 8192 13 1.6 M 1.9 X 1028 NA -57 6.1 X 103 IB IB IB 35
k 1 MW 52 GW 1 ns 524288 19 36 k 1.2 X 1027 NA -69 3.9 X 102 IB IB IB 23
l 1 GW 520 TW 1 ns 524288 19 36 k 1.2 X 1030 NA -39 3.9 X 105 IB IB IB 53

 

Wavelength = 656 nm

ETI Transmitting (Uplink) Telescope Diameter = 10.0 m

Earth Receiving Station (Downlink) Telescope Diameter = 10.0 m

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 -112 dBW = 6.3 X 10-12 W = 2.1 X 107 photons/s = 2.1 X 10-2 photons/ns (1.0 X 10-2 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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