This paper investigates the bit error rate (BER) performance of a radio-overfibre (RoF) system utilizing the binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) at a radio frequency (RF) of 5 GHz. The RF signal is externally modulated using the Mach-Zehnder modulator (MZM). The effects of noise sources and channels for the RoF link at distances of 30, 60, 90, 120 and 200 k...

Radio Frequency (RF) engineers are faced many times with the following two questions: “What are the effects of radio waves on human health?” and, more specifically, “What health risks are associated with the use of cell phones, mobile radios, microwave radios, microwave ovens, broadcast radio and television transmitters, power lines and X-rays?” In recent times, many people have expressed an in...

We determine the radio-frequency (rf) spectra for nonstationary states of a fermionic condensate produced by a rapid switch of the scattering length. The rf spectrum of the nonequilibrium state with constant BCS order parameter has two features in contrast with equilibrium where there is a single peak. The additional feature reflects the presence of excited pairs in the steady state. In the sta...

We demonstrate high-speed charge detection at room temperature with single-electron resolution by using a radio-frequency field-effect transistor (RF-FET). The RF-FET combines a nanometerscale silicon FET with an impedance-matching circuit composed of an inductor and capacitor. Driving the RF-FET with a carrier signal at its resonance frequency, small signals at the transistor’s gate modulate t...

We present a scheme to generate a 10 GHz optical frequency comb that is bandwidth reconfigurable on a time scale of tens of nanoseconds via electronic control of the drive signal to a phase modulator. When such a comb is used as the source for a radio-frequency (RF) photonic filter employing dispersive propagation, the RF filter bandwidth varies in inverse proportion to the optical bandwidth. A...

A high power oscillator circuit, designed to power radio-frequency ~rf! ion guides and traps, is described. The rf circuit is directly coupled to the guide/trap electrodes, and no frequency or impedance matching is required. The design provides precisely adjustable rf amplitudes from ;50 to 600 V, either under manual or computer control. The operating frequency can be varied from ,1 to ;30 MHz ...

This paper addresses the argument stating that since the energy of a single Radio Frequency (RF) photon is extremely small it cannot influence matter significantly and therefore RF radiation cannot cause cancer. The argument is shown to be wrong since most known phenomena and uses of RF radiation involve many photons acting in unison. For example, in a particle accelerator, a multitude of RF ph...

physical agents such as ultraviolet or ionizing radiation and repetitive trauma have been related to the causation of cancer in humans. much less clear is the association between exposure to radiofrequency, such as radar and microwave radiation to the development of cancer. sporadic case reports and small series suggest that this type of radiation might lead to cancer or contribute to its evolu...

We describe an alkali-metal magnetometer for detection of weak magnetic fields in the radio-frequency (rf) range. High sensitivity is achieved by tuning the Zeeman resonance of alkali atoms to the rf frequency and partially suppressing spin-exchange collisions in the alkali-metal vapor. We demonstrate magnetic field sensitivity of 2 fT/Hz(1/2) at a frequency of 99 kHz with a resonance width of ...

Universal relations that hold for any state provide powerful constraints on systems consisting of fermions with two spin states interacting with a large scattering length. In radio-frequency (rf) spectroscopy, the mean shift in the rf frequency and the large-frequency tail of the rf transition rate are proportional to the contact, which measures the density of pairs with small separations. We s...