38,717 research outputs found
Antenna-coupled TES bolometer arrays for CMB polarimetry
We describe the design and performance of polarization selective
antenna-coupled TES arrays that will be used in several upcoming Cosmic
Microwave Background (CMB) experiments: SPIDER, BICEP-2/SPUD. The fully
lithographic polarimeter arrays utilize planar phased-antennas for collimation
(F/4 beam) and microstrip filters for band definition (25% bandwidth). These
devices demonstrate high optical efficiency, excellent beam shapes, and
well-defined spectral bands. The dual-polarization antennas provide
well-matched beams and low cross polarization response, both important for
high-fidelity polarization measurements. These devices have so far been
developed for the 100 GHz and 150 GHz bands, two premier millimeter-wave
atmospheric windows for CMB observations. In the near future, the flexible
microstrip-coupled architecture can provide photon noise-limited detection for
the entire frequency range of the CMBPOL mission. This paper is a summary of
the progress we have made since the 2006 SPIE meeting in Orlando, FL
Antenna-coupled TES bolometer arrays for CMB polarimetry
We describe the design and performance of polarization selective
antenna-coupled TES arrays that will be used in several upcoming Cosmic
Microwave Background (CMB) experiments: SPIDER, BICEP-2/SPUD. The fully
lithographic polarimeter arrays utilize planar phased-antennas for collimation
(F/4 beam) and microstrip filters for band definition (25% bandwidth). These
devices demonstrate high optical efficiency, excellent beam shapes, and
well-defined spectral bands. The dual-polarization antennas provide
well-matched beams and low cross polarization response, both important for
high-fidelity polarization measurements. These devices have so far been
developed for the 100 GHz and 150 GHz bands, two premier millimeter-wave
atmospheric windows for CMB observations. In the near future, the flexible
microstrip-coupled architecture can provide photon noise-limited detection for
the entire frequency range of the CMBPOL mission. This paper is a summary of
the progress we have made since the 2006 SPIE meeting in Orlando, FL
The new generation CMB B-mode polarization experiment: POLARBEAR
We describe the Cosmic Microwave Background (CMB) polarization experiment
called Polarbear. This experiment will use the dedicated Huan Tran Telescope
equipped with a powerful 1,200-bolometer array receiver to map the CMB
polarization with unprecedented accuracy. We summarize the experiment, its
goals, and current status
Sub-Nyquist Field Trial Using Time Frequency Packed DP-QPSK Super-Channel Within Fixed ITU-T Grid
Sub-Nyquist time frequency packing technique was demonstrated for the first
time in a super channel field trial transmission over long-haul distances. The
technique allows a limited spectral occupancy even with low order modulation
formats. The transmission was successfully performed on a deployed Australian
link between Sydney and Melbourne which included 995 km of uncompensated SMF
with coexistent traffic. 40 and 100 Gb/s co-propagating channels were
transmitted together with the super-channel in a 50 GHz ITU-T grid without
additional penalty. The super-channel consisted of eight sub-channels with
low-level modulation format, i.e. DP-QPSK, guaranteeing better OSNR robustness
and reduced complexity with respect to higher order formats. At the receiver
side, coherent detection was used together with iterative maximum-a-posteriori
(MAP) detection and decoding. A 975 Gb/s DP-QPSK super-channel was successfully
transmitted between Sydney and Melbourne within four 50GHz WSS channels (200
GHz). A maximum potential SE of 5.58 bit/s/Hz was achieved with an OSNR=15.8
dB, comparable to the OSNR of the installed 100 Gb/s channels. The system
reliability was proven through long term measurements. In addition, by closing
the link in a loop back configuration, a potential SE*d product of 9254
bit/s/Hz*km was achieved
- …