Channel capacity optimization of chirp-limited dense WDM/WDMA systems using OOK/FSK modulation and optical filters

Li, C.-S.; Tong, F.; Liu, K.; Messerschmitt, David G.

doi:10.1109/50.156858

Cited by 36 publications

(10 citation statements)

References 39 publications

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“…In particular the dynamics of a single mode laser diode can be modelled by the laser rate equations [6], which describe the interactions among photon density p(t), carrier density n(t), and an equation describing the phase of the electric field φ(1) behaviour: dt dt rv g a 0 [n(t)-n 0 ]--…”

Section: The Modelmentioning

confidence: 99%

“…Then the optical spectrum is derived through FFT of the output intensity, which is directly derived by the photon density [6]. We take care to sample at a fast enough rate to reveal all the clipping events (0.5-1.2 ns) [1,2], considering an optical modulation index range of m = 0.005-0.2, which correspond, in this case, to a rms modulation depth (defined as μ = VNm 2 /2) interval of μ = 0.05-0.9.…”

Section: The Modelmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Clipping and Chirping Effects on AM-VSB CATV Sub-carrier Multiplexed Optical Systems

Sabella¹,

Paciotti²,

Fonzo³

1998

Journal of Optical Communications

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The concurrent effects of clipping distortion and frequency chirping, on directly modulated laser sources in cable television sub-carrier multiplexed systems, is analysed and discussed. The numerical model, which is proposed in this paper for the first time, allows the physical mechanisms of the laser diode to be taken into account. Simulation results show the impact of both the considered effects on the system performance, in terms of three distortion parameters: Composite Second Order (CSO), Composite Triple Beat (CTB) and Non-Linear Distortions (NLD). Taking into account all the effects influencing the performance, the reported method can be favourably used for the design of analog CATV distribution systems.

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Section: The Modelmentioning

confidence: 99%

Section: The Modelmentioning

confidence: 99%

Impact of Clipping and Chirping Effects on AM-VSB CATV Sub-carrier Multiplexed Optical Systems

Sabella¹,

Paciotti²,

Fonzo³

1998

Journal of Optical Communications

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show abstract

“…The finesse in (5), therefore increases monotonically with . Hence, the maximum finesse that is obtainable is given by (9) where , obtained by setting and in (2). We show in Fig.…”

Section: Discussionmentioning

confidence: 98%

“…When an external modulating signal is applied, the resulting optical spectrum of the modulated source is given by the convolution between the Lorentzian spectral density of the unmodulated laser field and the spectral density of the data signal, and is always wider than the unmodulated optical spectrum [1]. At the receiver, an optical filter may be used either to perform channel selection [1], [2] or to reduce optical noise such as the noise contributed by a relatively broadband fiber amplifier [3]. The bandwidth of the optical filter must be wide enough to pass most of the spectral components of the modulated source, but narrow enough to prevent optical noise and channel crosstalk from degrading the sensitivity of the system [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

An optical filter of adjustable finesse using an amplified fiber ring resonator

Chew

Tjhung

Mendis

1997

J. Lightwave Technol.

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We consider an optical filter constructed from a simple ring resonator with two electro-optical directional couplers and a fiber amplifier in the ring. By adjusting the coupling coefficient of the electro-optical directional couplers, the finesse of this optical filter can be controlled over a specified range. The variation in the insertion loss of the optical filter can be overcome by adjusting the gain of the fiber amplifier simultaneously. This paper analyzes theoretically the performance of the optical filter, as a function of the coupling coefficient of the electro-optical directional coupler and the gain of the fiber amplifier. We also show that it is possible to design an optical filter of wide adjustable finesse by changing only the coupling coefficient of the electro-optical directional couplers, leaving the gain of the fiber amplifier unchanged. This simpler method results only in a slight change in the insertion loss if an appropriate condition is chosen. The filter will be useful in coherent optical systems, where the bandwidth of the optical filter needs to be appropriately adjusted under varying biasing and signaling conditions, or as an optical discriminator with an adjustable Q-factor.

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“…In the case of direct laser modulation, the physical model of the laser is represented by the laser rate equations (as reported in [61); while in the case of external modulation, we consider a single model for the laser and for an electroabsorption modulator as reported in [7].…”

Section: Transmission System Modelingmentioning

confidence: 99%

Distortions compensation in linear optical links adopting wavelength converters based on FWM in semiconductor amplifiers

Sabella

Iannone

1996

Fiber and Integrated Optics

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Channel capacity optimization of chirp-limited dense WDM/WDMA systems using OOK/FSK modulation and optical filters

Cited by 36 publications

References 39 publications

Impact of Clipping and Chirping Effects on AM-VSB CATV Sub-carrier Multiplexed Optical Systems

Impact of Clipping and Chirping Effects on AM-VSB CATV Sub-carrier Multiplexed Optical Systems

An optical filter of adjustable finesse using an amplified fiber ring resonator

Distortions compensation in linear optical links adopting wavelength converters based on FWM in semiconductor amplifiers

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