102 km unrepeatered monomode fibre system experiment at 140 Mbit/s with an injection locked 1.52 μm laser transmitter

Malyon, D.J.; McDonna, A.P.

doi:10.1049/el:19820303

Cited by 44 publications

(4 citation statements)

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“…For the smallsignal analysis, the quantity N(t) � N 0 will equal the small-signal change in carrier density, denoted by n. The spontaneous emission term has been neglected because the test laser is biased above threshold. We also include both nonlinear gain saturation coefficients, e l and e u , as an improvement of a previous model [13,20] for injection locking in semiconductor QW lasers. Our contributions are listed bellow.…”

Section: Theory For Electrical Modulation Of Injection-locked Quantummentioning

confidence: 99%

“…(13). The value of the low frequency roll-off is extracted by comparing the electri cal modulation and optical absorption modulation of the test laser [25].…”

Section: Small-signal Electrical Modulation Of Injection-locked Fp Lamentioning

confidence: 99%

“…This is very attractive since it may allow one to achieve large modula tion bandwidths with conventional semiconductor lasers at room temperature, avoiding the use of advanced devices and the need for complicated fabrication techniques. Fur thermore injection locking in semiconductor lasers is an attractive method to ensure single mode operation [13], reduce the linewidth of a free-running laser [14], and eliminate mode partition noise [15], mode hopping, and fre quency chirp from modulated lasers [16]. The injectionlocking technique may also prevent spurious feedback effects that are random and difficult to avoid and can strongly disturb the behavior of the laser.…”

Section: Introductionmentioning

confidence: 99%

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Bandwidth enhancement of Fabry-Perot quantum-well lasers by injection-locking

Jin

Chuang

2006

Solid-State Electronics

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Theory and experiment for dc and small-signal electrical modulation of an injection-locked quantum-well (QW) Fabry-Perot laser are presented. Our experiment is realized by performing side-mode injection locking of a multiple-quantum-well (MQW) InGaAsP FabryPerot (FP) laser, which has the advantage of optical wavelength conversion. We first measure the dc characteristics and optical spectra of an injection-locked laser to define its locking range and linewidth enhancement factor. We then show experimentally that the bandwidth of an injection-locked semiconductor laser is 10.5 GHz, which is around twice the free-running electrical modulation bandwidth (5.3 GHz). The relaxation frequency of the injection-locked laser can be 3.5 times greater than the free-running value. Our theoretical model includes mode competition, gain saturation, low frequency roll-off, and optical confinement factor of the QW structure. The the ory shows good agreement with our experimental results. We point out that the small-signal modulation of injection-locked lasers still suffers severely from low frequency roll-off, which comes from the carrier transport effect and parasitic effect of the bias circuit. If we can reduce those effects, the modulation bandwidth can be further increased to 15 GHz, which is around 3 times of the free-running value.

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Section: Theory For Electrical Modulation Of Injection-locked Quantummentioning

confidence: 99%

“…(13). The value of the low frequency roll-off is extracted by comparing the electri cal modulation and optical absorption modulation of the test laser [25].…”

Section: Small-signal Electrical Modulation Of Injection-locked Fp Lamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bandwidth enhancement of Fabry-Perot quantum-well lasers by injection-locking

Jin

Chuang

2006

Solid-State Electronics

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“…A jointed length of 102 km of fibre on drum was used for studies of 140 Mbit/s transmission [5] and for video transmission using pulse frequency modulation (PFM) [6]. These experiments used injection-locked semiconductor laser transmitters.…”

Section: Exploitation Of 1500 Nm Wavelengthmentioning

confidence: 99%