Broadband video distribution over passive optical network using subcarrier multiplexing techniques

Rosher, P.A.; Fenning, S.C.; Ramsay, M.J.; Mendis, F.V.C.

doi:10.1049/el:19890085

Cited by 21 publications

(3 citation statements)

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“…Because these systems need very low received powers, the CNR is not prone to degradation due to RON. On the other hand, since the FM signal does not suffer as much from the effects of distortion, the use of a MZI will allow to increase the total optical modulation depth and thus, to greatly increase the loss budget of the link under consideration [19].…”

Section: Resultsmentioning

confidence: 99%

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Analog direct-modulation behavior of semiconductor laser transmitters using optical FM demodulation

Yabre¹

1998

J. Lightwave Technol.

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Abstract-In this paper, we report a theoretical investigation of the analog modulation performance of a semiconductor laser transmitter which employs the direct optical FM demodulation. This analysis is based on the rate equations in which Langevin noise functions are included. The optical FM response has firstly been derived using a chirp-power relation deduced from the rate equations. The chirp-to-power ratio (CPR) has secondly been computed and illustrated showing the effect of the novel damping parameter phenomenologically introduced in the rate equation for the optical phase. The curves show that the conventional CPR can be notably reduced using FM demodulation. Beside this, the comparison of the FM responses with prior studies show that our model may be more appropriate to describe optical FM behavior of many types of single-mode lasers. The relative-output noise (RON) at the transmitter has also been determined and subsequently used to calculate the carrier-to-noise ratio (CNR) available. It is shown that the transmitter inherent noise would significantly degrade as a result of the conversion of the optical frequency noise into intensity noise. Consequently, intrinsic noise is expected practically to contribute the most to CNR at high powers. This feature can be more easily appreciated through curves illustrating CNR and is in contrast to previous studies in which the receiver shot noise was assumed to be the main noise term.

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Section: Resultsmentioning

confidence: 99%

“…In (17) and (19), is the optical confinement factor whereas is the gain slope (in s 1 ). By applying the previous definition of the relative-intensity noise together with (13) and (15), a relatively simple expression can be derived for the laser without interferometer.…”

Section: B Noisementioning

confidence: 99%

Analog direct-modulation behavior of semiconductor laser transmitters using optical FM demodulation

Yabre¹

1998

J. Lightwave Technol.

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“…It has been demonstrated experimentally that a significant enhancement in SCM system performance can be achieved by laser overmodulation [ 8 ] , i.e. exceeding the linear region of the laser characteristic at the instant when all subcarriers are phase aligned.…”

Section: Introductionmentioning

confidence: 99%

Analysis of laser overmodulation techniques in subcarrier multiplexed optical fibre systems

Rosher

1990

IEEE International Conference on Communications, Including Supercomm Technical Sessions

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An approach for determining the significant intermodulation distortion products that occur in an overmodulated subcarrier multiplexed system is described. The analysis is based on obtaining a third order polynomial that represents the laser light-current characteristic when the laser is operated beyond its linear region. It is shown that the level of distortion is determined by the overall rms modulation depth, rather than individual subcarrier modulation depths or the number of subcarriers.

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Power budget improvement of multi-IFoF based analog indoor-distributed antenna system (DAS) with laser over-modulation

Kim

Sung

et al. 2019

Optics Communications

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Broadband video distribution over passive optical network using subcarrier multiplexing techniques

Cited by 21 publications

References 1 publication

Analog direct-modulation behavior of semiconductor laser transmitters using optical FM demodulation

Analog direct-modulation behavior of semiconductor laser transmitters using optical FM demodulation

Analysis of laser overmodulation techniques in subcarrier multiplexed optical fibre systems

Power budget improvement of multi-IFoF based analog indoor-distributed antenna system (DAS) with laser over-modulation

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