Laser diodes for CATV

Ackerman, D.A.; Zhang, L.M.; Sheridan-Eng, J.; Flynn, E.J.; Bylsma, R. B.

doi:10.1109/leos.1995.484648

Cited by 4 publications

(5 citation statements)

References 14 publications

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“…The figure indicates that all distortion types increase monotonically with the increase in f m1 , which predicts an increase in the CSO and CTB distortions in a multichannel system. This effect agrees with the experimental results in [7,17]. The figure indicates also that the IMD2 level is the highest, whereas the IMD3 is the lowest over the entire range of .…”

Section: Nonlinear Distortionssupporting

confidence: 91%

“…The channels position is another important issue for the quantification of the distortion effects. Ackemn et al confirmed that high‐frequency channels suffer greater distortion than lower‐frequency channels. Helms showed that both IMD2 and IMD3 increase with the increase in the modulation frequency reaching a maximum near the relaxation oscillation frequency.…”

Section: Introductionmentioning

confidence: 99%

“…CNR is strongly influenced by relative intensity noise (RIN) of the source laser . Water , Brillant , and Darcie et al showed that RIN of −155 dB/Hz or better is required to improve the CNR, whereas other researches confirmed that it should be less than −160 dB/Hz . On the other hand, degrading CSO below −60 dBc and CTB below −65 dBc cause the TV picture to appear by undesired tilted lines .…”

Section: Introductionmentioning

confidence: 99%

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Noise performance and nonlinear distortion of semiconductor laser under two‐tone modulation for use in analog CATV systems

Mahmoud

Ahmed

2015

Int J Numerical Modelling

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We introduce numerical modeling of noise performance and distortion of semiconductor lasers subject to two‐tone modulation according to the National Television Standards Committee NTSC plan for the cable television (CATV) signal transport. The waveform of the laser signal is simulated over wide ranges of the modulation index and placements of the modulation channel. The power and frequency spectra of the relative intensity noise (RIN) are characterized, and the associated second‐order harmonic distortion (2HD), and the second‐order (IMD2) and third‐order intermodulation distortions (IMD3) are calculated. The calculated data are used to predict the measures of the CATV system performance. The dynamic range of linearity of the laser is evaluated in terms of the spurious‐free dynamic range SFDR. We show that under weak modulation, the low‐frequency RIN is constant at −168 dB/Hz regardless the modulation frequency. Within this accepted noise level, IMD2 is 4 dBm higher than 2HD and 10 dBm higher than IMD3. When the modulation index exceeds 25%, the laser emits clipped signals associated with large values of signal distortions. Accepted values of the carrier to noise ratio and distortions correspond to lower modulation index and/or channel frequency. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Nonlinear Distortionssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Noise performance and nonlinear distortion of semiconductor laser under two‐tone modulation for use in analog CATV systems

Mahmoud

Ahmed

2015

Int J Numerical Modelling

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“…For HFC networks, it was the development of both directly 7 and externally modulated 8 highly linear transmitters, which were critical in limiting the adverse effects of second-and third-order nonlinear distortion products on the amplitude modulated subcarriers.…”

Section: Tdm Pon and Hfcmentioning

confidence: 99%

Optical access beyond 10 Gb/s PON

Iannone

Reichmann

2010

36th European Conference and Exhibition on Optical Communication

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“…At output power levels of 10-25 mW, f RO can exceed ∼10 GHz, which is particularly useful for subcarrier-multiplexing many narrow-band MHz class analog signals onto a single laser source, a capability that is commonly used by the cable television (CATV) industry [234,235]. However, for wide-band digital applications, direct modulation rates are practically limited to lower values, e.g., a few GHz, by parasitic capacitance in drive electronics or chirp-induced penalties [236].…”

Section: Direct Modulation and Semiconductor Laser Sourcesmentioning

confidence: 99%

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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Laser diodes for CATV

Cited by 4 publications

References 14 publications

Noise performance and nonlinear distortion of semiconductor laser under two‐tone modulation for use in analog CATV systems

Noise performance and nonlinear distortion of semiconductor laser under two‐tone modulation for use in analog CATV systems

Optical access beyond 10 Gb/s PON

Laser communication transmitter and receiver design

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