FSK heterodyne transmission experiments at 560 Mbit/s and 1 Gbit/s

Vodhanel, R.S.; Gimlett, J.L.; Cheung, N.K.; Tsuji, S.

doi:10.1109/jlt.1987.1075525

Cited by 21 publications

(6 citation statements)

References 28 publications

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“…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%

“…This can be compensated by pre-equalization of the modulation signal with a passive network in some cases [160,177,238]. However, this solution reduces the FM response and consequently leads to increased drive requirements.…”

Section: Spectral Shapingmentioning

confidence: 99%

See 2 more Smart Citations

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

confidence: 99%

Section: Direct Modulation and Semiconductor Laser Sourcesmentioning

confidence: 99%

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Laser communication transmitter and receiver design

Caplan

2007

J Optic Comm Rep

118

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“…In these previous works, FSK signal was either generated by direct modulation of electric current of a laser light source or by a very complex and elaborate device, which consist of several LiNbO3 Mach-Zehnder Modulators(MZM). However, to the first method, FSK bit rate is limited by the response of the laser [9,10]; while the complexity in both designing and manufacturing may lead to high cost and less popularity for the second one, though it can achieve high speed (40Gb/s). So far, FSK transmitter at 40 Gb/s and above is still a challenge.…”

Section: Introductionmentioning

confidence: 99%

A novel scheme of high bit rate optical FSK transmitter

Chi

Chen³

et al. 2007

SPIE Proceedings

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We propose a novel scheme of high bit rate optical frequency shift-keying transmitter. Base on the periodic notch spectral properties of Mach-Zehnder delay interferometer and the carrier suppressing functionality of Mach-Zehnder modulator, a high-speed optical FSK signal can be simply generated with another phase modulator and a single wavelength laser source. The transmission characteristics of this FSK signal are investigated under varying dispersion management. Simulated results show that 40Gb/s FSK signal gives only 1dB penalty after 80 km SMF transmission link under the post-compensation management scheme.

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“…In previous works, FSK signal was generated by direct modulation of electric current in a laser light source. Thus, FSK bit rate is limited by the response of the laser [4,5]. Parasitic intensity modulation in the direct modulation should be compensated by using an additional intensity modulator [3].…”

Section: Introductionmentioning

confidence: 99%

Optical FSK/IM Signal Generation Using an Integrated Optical FSK Modulator

Kawanishi

Higuma

Fujita

et al. 2004

IEICE Electron. Express

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Abstract:We demonstrate simultaneous optical modulation by frequency shift keying (FSK) and intensity modulation (IM) using a newly developed high-speed FSK modulator, for optical packet systems where payload and label signals are, respectively, in IM and FSK format. The modulator consists of four optical phase modulators, with travelingwave electrodes to obtain high-speed frequency switching and large frequency deviation in FSK modulation.

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FSK heterodyne transmission experiments at 560 Mbit/s and 1 Gbit/s

Cited by 21 publications

References 28 publications

Laser communication transmitter and receiver design

Laser communication transmitter and receiver design

A novel scheme of high bit rate optical FSK transmitter

Optical FSK/IM Signal Generation Using an Integrated Optical FSK Modulator

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