In this paper, we present a novel RF interconnection technique for the integration of high-speed photodiodes allowing multi-band rectangular waveguide (RW) interface from a single device. It is based on the dielectric rod waveguide (DRW) technology, which is known to offer broad bandwidths. The signal from photodiode is coupled to a rectangular slab DRW by the near-field coupling from a planar transition. The DRW also offers mechanical compatibility with standard RWs. By achieving the fundamental mode excitation, a broad working bandwidth of 75 GHz to 330 GHz is achieved in the simulated model. This corresponds to four frequency bands of WR-10, WR-8, WR-5 and WR-3.
We present the current challenges for high frequency interconnects, especially for calibrated measures of the frequency response of components operating above 100 GHz. This is the challenge addressed by the TERAmeasure Future and Emerging Technologies project, aiming to combine photonics and electronics to develop new paradigm in the millimetre and Terahertz frequency ranges, overcoming the current obstacles to better measurements, eliminating the frequency banded nature of rectangular waveguides and providing metrology-grade results across the full frequency range.
We report on a record broad 3-dB bandwidth of 14 nm (~1.8 THz around 1532 nm) optical frequency comb generated
from a passively mode-locked quantum-well (QW) laser in the form of photonic integrated circuits through an InP
generic photonic integration technology platform. This 21.5-GHz colliding-pulse mode-locked laser cavity is defined by
two on-chip reflectors incorporating intracavity phase modulators followed by an out-of-cavity SOA as booster. Under
certain operating conditions, an ultra-wide spectral bandwidth is achieved along with an autocorrelation trace confirming
the mode locking nature exhibiting a pulse width of 0.35 ps. The beat note RF spectrum has a linewidth of sub-MHz and
35-dB SNR.
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