Insertion loss

About: Insertion loss is a research topic. Over the lifetime, 23045 publications have been published within this topic receiving 272553 citations.

On-chip two-mode division multiplexing using tapered directional coupler-based mode multiplexer and demultiplexer

Abstract: We demonstrate a novel on-chip two-mode division multiplexing circuit using a tapered directional coupler-based TE(0)&TE(1) mode multiplexer and demultiplexer on the silicon-on-insulator platform. A low insertion loss (0.3 dB), low mode crosstalk (< -16 dB), wide bandwidth (~100 nm), and large fabrication tolerance (20 nm) are measured. An on-chip mode multiplexing experiment is carried out on the fabricated circuit with non return-to-zero (NRZ) on-off keying (OOK) signals at 40 Gbit/s. The experimental results show clear eye diagrams and moderate power penalty for both TE(0) and TE(1) modes.

Remote opto-chemical sensing with extreme sensitivity: design, fabrication and performance of a pigtailed integrated optical phase-modulated Mach-Zehnder interferometer system

Abstract: This paper describes the design, fabrication and testing of a pigtailed integrated optical (IO) phase-modulated Mach–Zehnder interferometer (MZI) including both the optical chip and the electronics. The optical chip is realised in SiON technology. The IO components (the sensing function, the straight waveguiding channels, the phase modulator, the polariser, the splitter, the combiner and the fibre-to-chip connection unit) are individually optimised and interconnected by using transversal adiabatic tapers. To obtain a high waveguide evanescent field sensitivity, the sensor is designed for — but not limited to — a wavelength of 632.8 nm. The integrated MZI is actively phase-modulated by virtue of the electro-optic effect of the incorporated material zinc oxide (ZnO). The electro-optical voltage–length product Vπ is 16 V cm at frequencies above 10 Hz. The polariser is a distributed function, that effectively filters TM-polarised light (TE/TM polarising ratio >30 dB). The fibre pigtail, affording remote optical sensing, is based on a cheap, easy-to-use fibre-to-chip connection with a typical coupling efficiency of 50%, while the device throughput (“insertion loss”) is −20 dB. The drive- and demodulation electronics enable a phase resolution 5×10−5×2π, corresponding to a refractive index resolution of 2×10−8. The sensing system as has been realised up to now shows a phase resolution of 1×10−4×2π, its long-term stability (hours) being ≤3×10−4×2π. This corresponds to a refractive index resolution of 5×10−8, and a long-term stability of 10−7.

Compact Wavelength-Selective Functions in Silicon-on-Insulator Photonic Wires

Abstract: We present a number of compact wavelength-selective elements implemented in silicon-on-insulator (SOI) photonic wires. These include arrayed waveguide gratings (AWGs), Mach-Zehnder lattice filters (MZLFs), and ring resonators. The circuits were fabricated with deep UV lithography. We also address the sensitivity of photonic wires to phase noise by selectively broadening the waveguides, and demonstrate this in a compact AWG with -20 dB crosstalk and an insertion loss of 2.2 dB for the center channels

On solid-state circuits.

Abstract: : Results are presented of a study program to advance the state of the art in UHF limiters, octave-band ferrite circulators, and low-noise receivers having linear phase response suitable for pulse-compression applications. Two practical varactor limiters were developed -- a broad-band configuration (octave range) using a PN diode, and a low threshold ultra-dynamic range configuration. The broad-band limiter was successfully tested at high pulse powers using a 1-megawatt radar. Its burnout energy was in excess of 87,000 ergs, provided 30 db of protection, had a recovery time of 0.5 micrn/econds, and did not exhibit any spike leakage. The low-threshold limiter had a limiting level of less than -20 dbm, an insertion loss of less than 2 db, and a dynamic range of about 70 db. A comprehensive theoretical and experimental technique was developed that was applied to the design anddevelopment of octave-wide Y-junction ferrite circulators. These circulators had isolations of greater than 20 db, SWR's of less than 1.4, and insertion losses of about 0.5 db over the complete octave range. (Author)

Mode-selective photonic lanterns for space-division multiplexing

Abstract: We demonstrate a 3x1 fiber-based photonic lantern spatial-multiplexer with mode-selectivity greater than 6 dB and transmission loss of less than 0.3 dB. The total insertion loss of the mode-selective multiplexers when coupled to a graded-index few-mode fiber was < 2 dB. These mode multiplexers showed mode-dependent loss below 0.5 dB. To our knowledge these are the lowest insertion and mode-dependent loss devices, which are also fully compatible with conventional few-mode fiber technology and broadband operation.