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Similar InAs/GaAs quantum-dot lasers emitting on either the ground or excited state are studied under optical feedback. The feedback-sensitivity and dynamics of the excited-state laser are investigated and compared to that of the ground-state laser.
The dynamics of C-band quantum-dot and quantum-dash lasers under small-signal modulation are compared. We show a strong influence of the density of states function on the cut-off frequency, being much higher for QDs at low currents, but reaching similar values for QDashes at higher currents.
Error-free (bit-error ratio < 10−9) generation and amplification of phase-coded signals are presented with a symbol rate up to 40 GBd using quantum-dot (QD) based semiconductor optical amplifiers (SOA) emitting at a wavelength of 1.3 µm. Phase-coded signal generation is demonstrated via direct modulation of a QD SOA exhibiting a linear fiber-to-fiber gain of 8 dB. In comparison to gain modulation,...
Non-linear properties of quantum-dot and quantum-dash lasers under dual-mode optical injection are investigated experimentally, showing higher nonlinearity of quantum-dash lasers. Frequency response measurements show equal 3 dB modulation bandwidth of 8 GHz.
40 GHz quantum-dot mode-locked lasers providing low-jitter optical and electrical microwave signals are investigated. 160 Gb/s data transmission based on differential quadrature phase-shift keying and optical time-division multiplexing is demonstrated using a packaged module.
Highly efficient wavelength conversion is observed by non-degenerate four-wave mixing in an InAs/GaAs quantum dot Fabry-Perot laser. A maximum normalized conversion efficiency of −3 dB, along with a high 35 dB optical SNR are reported.
Temperature-stable oxide-confined 980 nm vertical-cavity surface-emitting lasers for optical interconnects are presented. For the first time 40 Gbit/s 4-PAM data transmission is experimentally demonstrated at temperatures of 100 and 120°C.
We report on jitter reduction and frequency tuning ability of 1.31 µm 40 GHz quantum-dot mode-locked lasers with the main focus on hybrid mode locking. The frequency of the external electrical source is usually chosen to be close to the passive frequency of the mode-locked laser, which is increasingly difficult for high frequencies far beyond 40 GHz. Sub-harmonic mode locking is demonstrated, showing...
By exploiting different discrete optical transitions in a QD SOA, we demonstrate theoretical and experimental distortion-free simultaneous amplification of two counter-propagating 40 Gbit/s OOK signals separated by 93 nm for a wide operating-parameter range.
The static and dynamic properties of p-doped quantum-dot distributed-feedback lasers based on pure index-gratings are presented. Optical output power up to 34 mW, 58 dB SMSR, and 15 Gb/s error-free data rate are shown.
We compare dynamical properties of ground and excited state emission from 1.31 µm quantum-dot lasers. Dichroic facet mirrors ensure oscillations at either ground or excited state. Maximum bandwidths observed are 10.51 and 16.25 GHz, respectively.
We describe the technique allowing generation of wider frequency combs with low phase noise and pulses of shorter duration in quantum-dot mode-locked lasers. The devices are stabilized using coherent sidebands optical injection.
We report for the first time on the generation of short optical pulses based on passive mode locking of photonic band crystal lasers. Preliminary results demonstrate the feasibility and attractiveness of this technique for the generation of picosecond, high-power, high-brightness pulses in the GHz range.
Noise properties of 40 GHz passively mode-locked quantum-dot lasers under optical self-feedback are investigated theoretically and experimentally, showing five different regimes. We identify a regime of resonant feedback yielding a record RF-line-width reduction by 99%.
We examine nonlinear interactions between a short pulse and a CW oscillating field in a 1500nm quantum dot laser. A clear spectral hole is observed using X-FROG measurements which are confirmed by FDTD simulations.
We present a theoretical model supported by experiments showing that diode lasers having large gains with a small signal modulation which is limited by gain compression, can be modulated digitally at very high bit rates.
The unique properties of quantum dots (QDs) as gain material for semiconductor lasers result in advantageous characteristics like high temperature stability, low noise, low feedback sensitivity and low chirp. Their low internal losses make QD based devices suitable for high-speed telecommunication applications. Increase of data transmission rate by wavelength division multiplexing techniques requires...
Quantum-dot monolithic mode-locked lasers at 40 GHz show sub-ps pulses using dispersion compensation techniques. Their suitability for optical communication towards 100 Gbit Ethernet as well as properties using optical feedback are investigated.
Error-free wavelength conversion of a 40 Gb/s DPSK signal is presented in a wavelength range of 45 nm using a dual pump four-wave mixing scheme in a 1.3 μm quantum-dot semiconductor optical amplifier.
The static and dynamic characteristics of four-wave mixing in quantum dot semiconductor optical amplifiers are investigated. A high chip conversion efficiency of -2 dB at 0.6 nm detuning, a low (<; 5 dB) asymmetry of up-and down-conversion and a spectral range of 15 nm in which an optical signal-to-noise ratio above 20 dB is achieved. Relaxation times different for electrons and holes, 210 fs and...
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