Light intensity pulsations in an injection locked semiconductor laser

Mogensen, F.; Jacobsen, Gunnar; Olesen, H.

doi:10.1007/bf00620137

Cited by 29 publications

(8 citation statements)

References 10 publications

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“…Such a system has been briefly analyzed in the case of semiconductor lasers. 23 Regular pulsing with and without damped oscillations was found. However, semiconductor lasers have the peculiarity that their operating frequency and gain depend in a nontrivial way on the carrier density, and some approximations must be made to obtain a simple model.…”

Section: Introductionmentioning

confidence: 92%

“…(23) It is evident that A 2 , 3 has a real part that is positive for z > (23) 1; so the system reacts with stable oscillations at a frequency Q2 given by (24) hence, at point 1 in Fig. 2, the system relaxes to the steadystate value with a damped oscillation having a frequency (in units of K) of the order of (25)…”

Section: Lasers With Injected Signals: Stability Analysis Of a Class mentioning

confidence: 99%

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Instabilities in lasers with an injected signal

et al. 1985

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We consider a laser with an injected signal, in which the polarization can be adiabatically eliminated, we study the stability of the steady-state solutions, and we discuss the time-dependent solutions. For the laser alone, the only possible solution is constant intensity. However, the introduction of an external field, with an amplitude that does not satisfy the injection-locking condition, destabilizes the system. In such a case, numerical results show the existence of a self-Q-switching process, which induces relaxation oscillations. The frequency of the giant pulses is directly related to the amplitude of the external field, whereas the frequency of the relaxation oscillations depends on the damping rates. We show also that, depending on the value assigned to control parameters, the interaction between these frequencies leads to a chaotic behavior through intermittency or period-doubling bifurcations. Finally, topological equivalence between our laser system and a unidimensional circle map is shown for some values of control parameters.

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Section: Introductionmentioning

confidence: 92%

Section: Lasers With Injected Signals: Stability Analysis Of a Class mentioning

confidence: 99%

Instabilities in lasers with an injected signal

et al. 1985

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“…Equation (2) implies that correlation between the LO and EEPN phase noise contributions can be neglected which is a valid approximation for a normal transmission fiber for very short (few km) or longer distances (above the order of 80 km) [11]. The BER-floor position which is defined from the phase noise influence is specified as (for a DnPSK Rx) [12,13] Simulation results will be considered in Section 3 of this paper.…”

Section: Theorymentioning

confidence: 99%

“…Homodyne systems implementation were problematic because they should rely on analogue phase locked loops, that was very difficult to realize with semiconductor lasers even using optical injection locking to generate the carrier reference phase of the receiver (Rx) [2]. The heterodyne systems were influenced by the laser phase noise originated from the transmitter (Tx) and local oscillator (LO) lasers.…”

Section: Introductionmentioning

confidence: 99%

Phase Noise Influence in Coherent Optical DnPSK Systems with DSP based Dispersion Compensation

Jacobsen

Popov

et al. 2014

Journal of Optical Communications

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Abstract:We present a comparative study of the influence of dispersion induced phase noise for n-level PSK systems. From the analysis, we conclude that the phase noise influence for classical homodyne/heterodyne PSK systems is entirely determined by the modulation complexity (expressed in terms of constellation diagram) and the analogue demodulation format. On the other hand, the use of digital signal processing (DSP) in homodyne/intradyne systems renders a fiber length dependence originating from the generation of equalization enhanced phase noise. For future high capacity systems, high constellations must be used in order to lower the symbol rate to practically manageable speeds, and this fact puts severe requirements to the signal and local oscillator (LO) linewidths. Our results for the bit-error-rate (BER) floor caused by the phase noise influence in the case of QPSK, 16PSK and 64PSK systems outline tolerance limitations for the LO performance: 5 MHz linewidth (at 3-dB level) for 100 Gb/s QPSK; 1 MHz for 400 Gb/s QPSK; 0.1 MHz for 400 Gb/s 16PSK and 1Tb/s 64PSK systems. This defines design constrains for the phase noise impact in distributed-feed-back (DFB) or distributed-Bragg-reflector (DBR) semiconductor lasers, that would allow moving the system capacity from 100 Gb/s system capacity to 400 Gb/s in 3 years (1 Tb/s in 5 years). It is imperative at the same time to increase the analogue to digital conversion (ADC) speed such that the single quadrature symbol rate goes from today's 25 GS/s to 100 Gs/s (using two samples per symbol).

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“…Coherent optical systems have relatively high phase noise (PN) from transmitter and local oscillator (LO) lasers [1][2][3]. The phase estimation algorithms used in such systems have non-zero probability of cycle slips [4,5].…”

Section: Introductionmentioning

confidence: 99%

Low-complexity BCH codes with optimized interleavers for DQPSK systems with laser phase noise

et al. 2016

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The presence of high phase noise in addition to additive white Gaussian noise in coherent optical systems affects the performance of forward error correction (FEC) schemes. In this paper, we propose a simple scheme for such systems, using block interleavers and binary Bose-Chaudhuri-Hocquenghem (BCH) codes. The block interleavers are specifically optimized for differential quadrature phase shift keying modulation. We propose a method for selecting BCH codes that, together with the interleavers, achieve a target post-FEC bit error rate (BER). This combination of interleavers and BCH codes has very low implementation complexity. In addition, our approach is straightforward, requiring only short pre-FEC simulations to parameterize a model, based on which we select codes analytically. We aim to correct a pre-FEC BER of around 10 −3 . We evaluate the accuracy of our approach using numerical simulations. For a target post-FEC BER of 10 −6 , codes selected using our method result in BERs around 3× target, and achieve the target with around 0.2 dB extra signal-to-noise ratio.

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Light intensity pulsations in an injection locked semiconductor laser

Cited by 29 publications

References 10 publications

Instabilities in lasers with an injected signal

Instabilities in lasers with an injected signal

Phase Noise Influence in Coherent Optical DnPSK Systems with DSP based Dispersion Compensation

Low-complexity BCH codes with optimized interleavers for DQPSK systems with laser phase noise

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