Laser Linewidth Estimation by Means of Coherent Detection

Duthel, T.; Clarici, G.; Fludger, C.R.S.; Geyer, J. C.; Schulien, C.; Wiese, Stefan

doi:10.1109/lpt.2009.2029072

Cited by 36 publications

(15 citation statements)

References 6 publications

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“…For laser linewidth monitoring, a wide dynamic range of 100 kHz to 10 MHz with corresponding maximum estimation error below 1% is achieved. Such monitoring performance is comparable to others reported in the literature [4] that only monitors laser linewidths. It is also noted that the monitoring performance does not depend on the dispersion map of the transmission link.…”

Section: Simulation Results and Discussionsupporting

confidence: 85%

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Simultaneous and independent multi-parameter monitoring with fault localization for DSP-based coherent communication systems

Shen¹,

Lau²,

Chen³

2010

Opt. Express

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Digital signal processing (DSP)-based coherent communications have become standard for future high-speed optical networks. Implementing DSP-based advanced algorithms for data detection requires much more detailed knowledge of the transmission link parameters, resulting in optical performance monitoring (OPM) being even more important for next generation systems. At the same time, the DSP platform also enables new strategies for OPM. In this paper, we propose the use of pilot symbols with alternating power levels and study the statistics of the received power and phase difference to simultaneously and independently monitor the carrier frequency offset between transmitter and receiver laser, laser linewidth, number of spans, fiber nonlinearity parameters as well as optical signal-tonoise ratio (OSNR) of a transmission link. Analytical predictions are verified by simulation results for systems with full chromatic dispersion (CD) compensation per span and 10% CD under-compensation per span. In addition, we show that by monitoring the changes in the statistics of the received pilot symbols during network operation, one can locate faults or OSNR degradations along a transmission link without additional monitoring equipments at intermediate nodes, which may be useful for more efficient dynamic routing and network management.

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Section: Simulation Results and Discussionsupporting

confidence: 85%

“…Cao et al [3] proposed a technique for frequency offset monitoring without removing the signal phase. Furthermore, Duthel et al [4] demonstrated laser linewidth monitoring by means of coherent detection with a monitoring range up to 1 MHz.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous and independent multi-parameter monitoring with fault localization for DSP-based coherent communication systems

Shen¹,

Lau²,

Chen³

2010

Opt. Express

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“…Nesta nova fase, o crescimento vertiginoso da Internet saturou os sistemas WDM+EDFA existentes e as soluções propiciadas pelas comunicações coerentes foram novamente investigadas [19,20]. Com isso, os estudos sobre as técnicas de medição da largura de linha de lasers foram retomados [21,22], assim como as pesquisas dos efeitos da largura de linha na recepção óptica coerente [23]. Novos lasers semicondutores monolíticos com largura de linha estreita, com sintonia do comprimento de onda baseadas em cavidades externas integradas foram desenvolvidos [24], assim como novas técnicas para a medição da largura de linha [25,26] e estudos numéricos correlatos [27].…”

Section: Ruído De Fase Em Lasersunclassified

Técnica de Aquisição Off-Line da Coerência em Onda Contínua de Lasers Semicondutores com Cálculo do Tempo de Atraso

Rodigheri¹,

Sutili²,

Conforti³

2019

Anais De XXXVII Simpósio Brasileiro De Telecomunicações E Processamento De Sinais

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“…On the other hand, the linewidth parameter does not provide in-depth information about laser spectral properties. The approach to describe laser characteristics by using the power spectral density of phase noise provides complex information about the laser spectral properties [16][17][18]. The laser spectrum approximation by Voigt probability distribution allows inclusion of the essential contributions of the white phase noise and 1/ -phase noise simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…However, the methods are limited by the attainable bandwidth and the number of samples used in numerical evaluation. By taking this into consideration, the laser spectral PSD can be directly modelled by Rice distribution [18,19]. In Section 2, we describe the derivation of the laser PSD and linewidth formulas.…”

Section: Introductionmentioning

confidence: 99%

Numerical Estimation of Spectral Properties of Laser Based on Rate Equations

Litvik

Kuba

Benedikovič

et al. 2016

Mathematical Problems in Engineering

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Laser spectral properties are essential to evaluate the performance of optical communication systems. In general, the power spectral density of the phase noise has a crucial impact on spectral properties of the unmodulated laser signal. Here the white Gaussian noise and1/f-noise are taken into the consideration. By utilizing the time-dependent realizations of the instantaneous optical power and the phase simultaneously, it is possible to estimate the power spectral density or alternatively the power spectrum of an unmodulated laser signal shifted to the baseband and thus estimate the laser linewidth. In this work, we report on the theoretical approach to analyse unmodulated real-valued high-frequency stationary random passband signal of laser, followed by presenting the numerical model of the distributed feedback laser to emulate the time-dependent optical power and the instantaneous phase, as two important time domain laser attributes. The laser model is based on numerical solving the rate equations using fourth-order Runge-Kutta method. This way, we show the direct estimation of the power spectral density and the laser linewidth, when time-dependent laser characteristics are known.

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Laser Linewidth Estimation by Means of Coherent Detection

Cited by 36 publications

References 6 publications

Simultaneous and independent multi-parameter monitoring with fault localization for DSP-based coherent communication systems

Simultaneous and independent multi-parameter monitoring with fault localization for DSP-based coherent communication systems

Técnica de Aquisição Off-Line da Coerência em Onda Contínua de Lasers Semicondutores com Cálculo do Tempo de Atraso

Numerical Estimation of Spectral Properties of Laser Based on Rate Equations

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