Optical FSK transmission with pattern-independent 119 photoelectrons/bit receiver sensitivity and endless polarisation control

Noé, R.; Rodler, H.; Ebberg, A.; Gaukel, G.; Auracher, F.

doi:10.1049/el:19890511

Cited by 12 publications

(5 citation statements)

References 2 publications

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“…To improve receiver sensitivity, high-order M -ary orthogonal formats [18] such as M -PPM, M -FSK [160][161][162], and hybrid combinations can be used (see also section 5.3). While not spectrally efficient, these formats can significantly improve photonefficiency.…”

Section: -Ary Orthogonal Modulationmentioning

confidence: 99%

“…As with DPSK, FSK waveforms can have a 100% duty cycle, making it well suited for use with average or peak powerlimited transmitters. It can be implemented using a single frequency-modulated (FM) source with binary- [162,[177][178][179] or M -ary modulation [160,180], or using external modulation and subcarrier multiplexing (SCM) [181,182]. These approaches generally require relatively tight wavelength spacing due to transmitter or receiver limitations [161].…”

Section: -Ary Frequency-shift Keying (M -Fsk)mentioning

confidence: 99%

“…While direct modulation is an easy means of applying the intensity modulation suitable for OOK, there is a residual wavelength (or frequency) modulation or chirp (dφ/dt) due to fast current density fluctuations and a slower temperature dependence of the refractive index in the active layer which causes a shift in the laser wavelength [233,237]. In fact, the fast change in laser frequency can be used for directly generating FM waveforms [160,162,177,178,180,238]. For the case of large frequency deviations, the residual IM due to current changes may need to be compensated.…”

Section: Direct Modulation and Semiconductor Laser Sourcesmentioning

confidence: 99%

“…However, this solution reduces the FM response and consequently leads to increased drive requirements. Another means of mitigating these effects is to limit the low-frequency drive content through pattern coding/scrambling [160,162,248], which can be achieved by driving the laser with low-duty-cycle waveforms such M -ary PPM or FSK modulation formats (see Fig 9). In addition, for low-duty-cycle waveforms, directly-modulated DFB lasers can be used in cascade with an external modulator and/or narrow-band optical filters to achieve time/frequency windowed direct modulation.…”

Section: Spectral Shapingmentioning

confidence: 99%

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Laser communication transmitter and receiver design

Caplan

2007

J Optic Comm Rep

117

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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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Section: -Ary Orthogonal Modulationmentioning

confidence: 99%

Section: -Ary Frequency-shift Keying (M -Fsk)mentioning

confidence: 99%

Section: Direct Modulation and Semiconductor Laser Sourcesmentioning

confidence: 99%

Section: Spectral Shapingmentioning

confidence: 99%

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Laser communication transmitter and receiver design

Caplan

2007

J Optic Comm Rep

117

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show abstract

“…These systems suffer from signal distortions introduced by the nonuniform FM-response of the lasers (e.g. MQWDFB in [1], MCRW in [2]). Therefore encoding or equalization is necessary.…”

Section: Introductionmentioning

confidence: 99%