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Advanced wavelength-division multiplexing (WDM) requires both efficient multi-wavelength light sources to generate optical carriers and highly scalable photonic-electronic interfaces to encode data on these carriers. In this paper, we give an overview on our recent progress regarding silicon-organic hybrid (SOH) integration and comb-based WDM transmission.
Chip-scale frequency comb sources are likely to become key elements of future terabit/s optical transceivers. We investigate and demonstrate the viability of different comb generation schemes for transmission at multi-terabit/s data rates.
The objective of the SCIAMACHY mission requires the instrument to be capable of determining concentrations of a large number of trace gas species over the full vertical extent of the atmosphere from the troposphere up to the mesosphere. In addition, aerosol properties as well as pressure and temperature shall be derived. Therefore SCIAMACHY was designed as a passive imaging spectrometer, comprising...
We present a novel feed-forward laser linewidth reduction scheme. The linewidth of a DFB laser is reduced from 9.4MHz to 37.2kHz. Sixteen modes of a mode-locked laser are simultaneously reduced from ∼20MHz to below 300kHz.
We demonstrate two 1Tbit/s superchannel architectures using a compact, FSR-tunable gain-switched comb source. SSMF transmission of 18GBaud Nyquist-WDM shaped PDM-QPSK and PDM-16QAM modulation is reported, with a capacity up to 1.296Tbit/s and SE of 7.2bit/s/Hz.
We propose a novel technique to measure the correlation between two optical frequencies using a FWM scheme. To verify, we measure the evolution of de-correlation as a function of the path length difference between them.
Wavelength conversion via four-wave mixing (FWM) schemes of high-bit rate data formats are conventionally achieved using a strong pump source and a secondary nonlinear device, such as highly nonlinear fibre [1] or semiconductor optical amplifier [2]. In this work we obviate the need for a secondary nonlinear device, and achieve wavelength-conversion of high repetition-rate pulse trains by externally...
We demonstrate for the first time a detailed phase noise characterization of Y-branch lasers. BER tests of 10.7GBaud DQPSK revealed the effect of phase noise at frequencies around the relaxation oscillation peak on system performance.
Optical Frequency Combs are becoming increasingly important for the development of future photonics systems. In this work we present the detailed characterization of optical frequency combs that can be employed in future supechannel Tbit/s transmission systems.
Phase locked frequency combs spanning > 1.5 THz have been generated using passively mode locked quantum dash based lasers emitting at 1.55 µm. These combs are particularly suited for future OFDM transmission systems.
Device characterizations of QDash semiconductor lasers as a subchannel comb generator are presented, including measurements of electric field, optical linewidth, and mode coherence out to 1.5THz spectral mode separation.
The ability to shape the spectral amplitude and phase of optical signals is a key requirement in the fields of optical arbitrary waveform generation (O-AWG) and optical communications. To this end much effort has been directed towards developing programmable Fourier-domain optical processors (FDOP) capable of adjusting the amplitude and phase of the individual spectral components of an input optical...
Quantum-dash modelocked laser diodes (QD-MLLD) are capable of producing short optical pulses at extremely high repetition rates. As such they are ideally suited to many telecommunications applications [1]. In this paper we present a linear self-referenced measurement of the spectral amplitude and phase of a free-running quantum-dash modelocked laser diode. The technique is suitable for measuring optical...
The nonlinear propagation characteristics in a hydrogenated amorphous silicon core optical fiber are investigated to demonstrate ultra-fast all-optical switching by cross-absorption modulation.
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