Performance evaluation of the high-speed deep-space optical communication system assisted by preamplified thresholded pulse-position modulation

Abstract

Deep-space free-space optical (FSO) communication utilized the light wave as carriers for information transfer which has the major benefit of small size, lightweight, and low consumption compared with microwave communication loaded with the same data rate. The M-ary pulse-position modulation (M-PPM) format is a favorable choice for deep-space FSO communication by means of its high sensitivity. The preamplified thresholded M-PPM technique has been confirmed, and a corresponding demonstration has been accomplished with data rates of 1.25 Gbps and 2.00 Gbps separately. The receiving sensitivities (BER@1 × 10−3) of 1.25 Gbps and 2.00 Gbps 16-PPM have been detected as -57.51 dBm (11.04 photons/bit) and -55.03 dBm (12.25 photons/bit), respectively. Simultaneously, the high extinction ratio of M-PPM has been achieved, for example, the extinction ratio of 16-PPM has been detected as 39.51 and 38.27 dB for 1.25 Gbps and 2.00 Gbps, which are 17.60 and 17.44 dB higher than that of on–off keying (OOK) modulation, respectively. The results imply that our communication scheme possessed high sensitivity and eliminated the requirements of single-photon detectors (SPDs) and high-speed analog-to-digital converters (ADCs) which finds an alternative solution for deep-space FSO communication.

Efficient Encoding Method for Combined Codes in the MWD Telemetry System

“…MPPM (Multipulse Position Modulation) [6][7][8][9] is a pulse code technology. Due to its high energy efficiency, MPPM is widely used in fields such as fiber optic communication and free-space communication because it can send more than ten bits of data with only a few pulses [10][11][12][13][14][15][16][17]. The principle of MPPM is to divide the transmission time of the code symbol of a combination code into N time slots and only select M time slots to send pulses.…”