Receiver sensitivity improvement by impulsive coding

Boivin, L.; Nuss, M. C.; Shah, Jainisha; Miller, D. A. B.; Haus, H.A.

doi:10.1109/68.588209

Cited by 37 publications

(20 citation statements)

References 9 publications

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“…The power penalty for both formats is 0.7 dB for the 10 Gbit/s rate, 338 diffraction angle and 5 mm aperture size. The experiments show a back-to-back BER difference of 1.9 dB for RZ compared to NRZ consistent with theory [5]. The eye diagrams for RZ and NRZ shown in Fig.…”

Section: Modsupporting

confidence: 75%

Bit error rate measurements of diffraction by non-true-time-delay, holographic optical element

Tsui¹,

Roth²

2009

Electron. Lett.

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The impact on digital communications performance from non-truetime-delay beam steering by a holographic optical element (HOE) is investigated. Free-space data transmission experiments were performed using an HOE with a 5 mm diameter and 338 diffraction angle at the data rate of 10 Gbit/s with return-to-zero and non-return-to-zero formats. For this diffraction case, a small penalty of 0.7 dB at 10 29 bit error rate is observed for both formats. This penalty is smaller than the optical loss but would be expected to increase for larger diameters and data rates.Introduction: Developments in volume holographic optical elements (HOEs) fabricated using photo-thermo-refractive glass [1] have opened applications of HOEs in light-weight, agile, large-angle, largeaperture beam steering [2]. However, since all Bragg-based diffraction devices exhibit non-true-time delay (NTTD), a beam diffracted by an HOE experiences a temporal delay that varies transversely across the beam in the plane of diffraction. These distortions could be significant in free-space-optical (FSO) communication applications that require high data rates and large apertures, and rely on diffraction-based, beam steering techniques.An HOE exhibits a sinusoidally modulated refractive index as depicted in Fig. 1. This modulation, represented by a grating vector, leads to diffraction in the y -z plane. The diffraction process involves a wave incident to the interface at angle u 1 satisfying the Bragg condition. The transmissive type HOE, more practical for beam steering, is depicted in Fig. 1 and was used in our experiments. This HOE is made of photo-thermo-refractive glass, with grating parameters described by a slant angle (f) of 908, a thickness (L) of 1.16 mm and a grating wavelength (L) of 1420 nm. The refractive index modulation is 640 ppm, and the diffraction efficiency at the Bragg angle of u 1 ¼ u 3 ¼ 338 is greater than 96% for a 5 mm collimated beam diameter.

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Section: Modsupporting

confidence: 75%

Bit error rate measurements of diffraction by non-true-time-delay, holographic optical element

Tsui¹,

Roth²

2009

Electron. Lett.

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“…As noted by Personick [39] in 1973, and more recently, demonstrated by Boivin et al [343], such techniques can lead to several dB enhancement of RX sensitivity. Discussion of the transmitter considerations of using such waveforms is given in section 3.5.5, and we elaborate on the use of this class of waveforms in section 5.1 for preamplified receivers.…”

Section: Direct Detection-pinmentioning

confidence: 93%

“…The ability to maintain transmission efficiency over a wide range of duty cycles, which is facilitated by high-gain and average-power limited properties of optical amplifiers [11,[343][344][345][346], allows for aggressive pulse shaping at the transmitter. This can improve receiver sensitivity and provide flexible multi-rate capabilities with simplified receiver design options [11,12,15], a subject discussed below and further in section 5.…”

Section: High Power Optical Amplifiermentioning

confidence: 99%

Laser communication transmitter and receiver design

Caplan

2007

J Optic Comm Rep

118

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Free-space laser communication systems have the potential to provide flexible, high-speed connectivity suitable for long-haul intersatellite and deep-space links. For these applications, power-efficient transmitter and receiver designs are essential for cost-effective implementation. State-of-the-art designs can leverage many of the recent advances in optical communication technologies that have led to global wideband fiber-optic networks with multiple Tbit/s capacities. While spectral efficiency has long been a key design parameter in the telecommunications industry, the many THz of excess channel bandwidth in the optical regime can be used to improve receiver sensitivities where photon efficiency is a design driver. Furthermore, the combination of excess bandwidth and average-power-limited optical transmitters has led to a new paradigm in transmitter and receiver design that can extend optimized performance of a single receiver to accommodate multiple data rates. This paper discusses state-of-the-art optical transmitter and receiver designs that are particularly well suited for average-power-limited photon-starved links where channel bandwidth is readily available. For comparison, relatively simple direct-detection systems used in short terrestrial or fiber optic links are discussed, but emphasis is placed on mature high-performance photon-efficient systems and commercially available technologies suitable for operation in space. The fundamental characteristics of optical sources, modulators, amplifiers, detectors, and associated noise sources are reviewed along with some of the unique properties that distinguish laser communication systems and components from their RF counterparts. Also addressed is the interplay between modulation format, transmitter waveform, and receiver design, as well as practical tradeoffs and implementation considerations that arise from using various technologies.

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“…First, receiver performance is limited by the thermal noise floor of the avalanche photodiode (APD), so the use of high-peak-power low-duty-cycle waveforms provides a means of improving the detected signal-to-noise ratio (SNR) given an average-power-limited source. 7,8 In addition, since the number of bits per symbol grows as the PPM symbol size M is increased (and corresponding duty cycle is decreased), this also improves the receiver sensitivity as measured in photons/bit. 9 As a result, changes in waveform duty cycle M are are selected as the primary means through which the system adapts to changing link conditions.…”

Section: Transmitter Design Validationmentioning

confidence: 99%

Implementation and validation of a CubeSat laser transmitter

2016

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The paper presents implementation and validation results for a CubeSat-scale laser transmitter. The master oscillator power amplifier (MOPA) design produces a 1550 nm, 200 mW average power optical signal through the use of a directly modulated laser diode and a commercial fiber amplifier. The prototype design produces highfidelity M-ary pulse position modulated (PPM) waveforms (M=8 to 128), targeting data rates > 10 Mbit/s while meeting a constraining 8 W power allocation. We also present the implementation of an avalanche photodiode (APD) receiver with measured transmitter-to-receiver performance within 3 dB of theory. Via loopback, the compact receiver design can provide built-in self-test and calibration capabilities, and supports incremental on-orbit testing of the design.

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Receiver sensitivity improvement by impulsive coding

Cited by 37 publications

References 9 publications

Bit error rate measurements of diffraction by non-true-time-delay, holographic optical element

Bit error rate measurements of diffraction by non-true-time-delay, holographic optical element

Laser communication transmitter and receiver design

Implementation and validation of a CubeSat laser transmitter

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