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Current status of OCTAVE

Current status of OCTAVE. Yusuke Kono 1 , Tomoaki Oyama 1 , Noriyuki Kawaguchi 1 , Kotaro Niinuma 2 , Kenta Fujisawa 2 , Hiroshi Takaba 3 , Kazuhiro Sorai 4 , Mamoru Sekido 5 , Shinobu Kurihara 6 , Yasuhiro Murata 7 National Astronomical Observatory of Japan 1 ,

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Current status of OCTAVE

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  1. Current status of OCTAVE Yusuke Kono1, Tomoaki Oyama1, Noriyuki Kawaguchi1, Kotaro Niinuma2, Kenta Fujisawa2, Hiroshi Takaba3, Kazuhiro Sorai4, Mamoru Sekido5, Shinobu Kurihara6, Yasuhiro Murata7 National Astronomical Observatory of Japan1, Yamaguchi university2,Gifu university3, Hokkaido university4 NICT5, GSI6, JAXA7

  2. Contents • OCTAVE Array • OCTAVE Family • EHT application

  3. OCTAVE : Optically ConnecTedArray for VlbiExploration • eVLBI network in Japan • High sensitivity, on-the-fly result and low cost operation The longest baseline is 1,300km Hokkaido univ. 11m JAXA Usuda 64m* Yamaguchi univ. 32m GSI Tsukuba 32m Ibaraki Univ.* 32m x 2 NAOJ NRO 45m* NICT Kashima 34m* Gifu univ. 11m

  4. Communication lines • Supplied by academic network (SINET4) and Test bed network (JGN-X) • 10GbE to nodes • 2x10GbE to Correlatorat HQ of NAOJ in Tokyo • Kashima and Ibaraki are offline now. Trying to connect. • Usudaand NRO are offline now Network configuration (Plan) Local Recorders, OCTADISK and K5, are installed into Usuda, NRO, Ibaraki and Tomakomai for a while.

  5. Observation capability • X-band • Usuda64, Kashima34*, Yamaguchi32, Ibaraki32 • 8192-8704MHz, BW512MHz x 1/2pols • K-band • NRO45, Kashima34*, Yamaguchi, Ibaraki32, Gifu11, Tomakomai11m • 21.5-23.8GHz, BW512MHz x 1/2pols Kashima34* will be available if the network is connected.

  6. Data processing and results • Image of 4C32.44 • X-band, BW512 MHz, 4stations • software: AIPS • VLBI Detections of Parsec-Scale Nonthermal Jets in Radio-Loud Broad Absorption Line Quasars, Doi et al., 2009 • VLBI Observation of Fermi/LAT Un-associated Gamma-ray Sources, Niinumaet al.,2013 • Science Obs. proposals are selected and operated by JVN(Japanese VLBI Network)

  7. International Observation • Recording and copying function at NAOJ/Tokyo • Fringe test with EAVN (East Asia VLBI Network) • September 2013, 14 stations • Fringe test with Noto • April 2013 K5 (NiCT) Mark5B+ (Haystack) OCTADISK (NAOJ) DF

  8. Octave family • We have developed several instruments for OCTAVE. We call them Octave family. • OCTAVIA • OCTAVeoptIcal Adapter • OCTADISK • OCTAve Recorder • OCTACOR • OCTAveCorrelator • OCTAD • OCTaveADc • OCTADIV • OCTAveDIVider • Many non-OCTAVE family instruments are also used in the array, • such as ASD1000/3000, K5(NICT) and Mark5B(Haystack).

  9. OCTAVIA (OCTAVeoptIcal Adapter) • Converter between VSI and 10GbE • Electrical I/O • VSI-H 4 Ports • Total 8 Gbps • Optical I/O • 10GbE • Protocol • VDIF/UDP/IP/10GbE VSI 10GbE ADC etc OCTAVIA Network etc Work by Dr Oyama (NAOJ)

  10. OCTADISK • DISK Recorder • I/O • 10GbE (up to 4Gbps) • Use with OCTAVIA • Portable module • 12 HDDs /module • dedicated format. • Under Operation at the VERA stations. Work by Dr Oyama (NAOJ)

  11. OCTADISK2 • OCTADISK2 is under development • Parts discontinuance of OCTADISK • COTS base, except Chassis • OS:Linux, Linux file system • Portable module • same to OCTADISK Prototype “Perfect COTS” Work by Mr Suzuki and Dr Oyama (NAOJ)

  12. OCTAVIA/DISK in KJCC • NAOJ supplied Raw VLBI Data Buffer to KJCC VSI Input from various terminals Storage on HDD output Synchronized data to VCS Origin of OCTAVIA and OCTADISK http://kvn-web.kasi.re.kr/en/en_under_correlator.php

  13. Correlators for OCTAVE • Real time correlator • FPGA correlator • FX and XF type • 2Gbps/station • Post processing correlator • Software correlator • Engine(GICO3) by NICT • Integration by NAOJ with NICT Work by Dr Oyama (NAOJ) Soft Correlators Hard Correlators

  14. OCTAD (ADC) • Direct RF sampling • 22GHz (43GHz, under test) • Wide bandwidth • 8.192Gsps-3bit • use with a RF band pass filter • For next generation VERA system • Wideband observation enable us to use weaker and closer reference sources of dVLBI astrometry

  15. OCTAD • Lab. test of sampling jitter • 0.17 psec (Lc<1% @43GHz) • Fringe test observation • Mizusawa 10m x 20m BL=60m • 16Gbps x 2 OCTAD Jitter0.17psec Lc <1% PI: Dr Oyama (NAOJ)

  16. Upgraded OCTAD • We add two functions • DBBC • Backward compatibility • BW:16MHz~2048MHz/ch • External AD module up to 50GHz • V-connector • Direct receiving 50GHzModule

  17. EHT / ALMA Phasing • Event Horizon Telescope • Japanese contribution • Data transfer from AOS to OFS • AOS: Telescope site • OSF: Operations Support Facility • 64Gbps(8Gbps x8ch) • A single dark fiber • Design started at 2011. Telescopes and Phasing • Optical link 30km VLBI Recorder Storage Transfer and Correlation PI: Prof. Honma (NAOJ)

  18. EHT / ALMA Phasing XFP • WDM of 16 wavelengths by 10GbE-ZR OFS AOS PIC XFP XFP –ZR lambda1 AWG1 AWG1 XFP –ZR lambda2 XFP REC AWG2 AWG2 PIC XFP XFP –ZR lambda3 AWG3 AWG3 XFP –ZR lambda4 XFP REC AWG4 AWG4 PIC XFP XFP –ZR lambda5 AWG5 AWG5 XFP –ZR lambda6 XFP REC AWG6 AWG6 PIC XFP XFP –ZR lambda7 AWG7 AWG7 XFP –ZR lambda8 XFP REC AWG8 AWG8 PIC XFP XFP –ZR lambda9 AWG9 AWG9 XFP –ZR lambda10 XFP REC AWG10 AWG10 PIC XFP XFP –ZR lambda11 AWG11 AWG11 XFP –ZR lambda12 XFP REC AWG12 AWG12 PIC XFP XFP –ZR lambda13 AWG13 AWG13 XFP –ZR lambda14 XFP REC AWG14 AWG14 PIC XFP XFP –ZR lambda15 AWG15 AWG15 XFP –ZR lambda16 XFP REC AWG16 AWG16 Monitor Power Power Monitor Power Power Moni. (Ethernet)

  19. EHT / ALMA Phasing • OFL (Opical Fiber Link) • NAOJ/Elecs corp. • High Cost performance • “Error Free” is confirmed OFLs for AOS and OSF optical attenuator Expected Attenuation between AOS and OFS OFL at Haystack

  20. Summary • Introduction of Octave and Octave family • Application of OCTAVE technology to EHT/WDM

  21. backup

  22. Jitter measurement • Synchronized SG input • Phase are extracted by FFT GODSG AD storage input SG CLK DIST FFT FFT FFT ・・・

  23. Phase fluctuations • 18.424GHz • 14.328GHz • 10.232GHz • 6.136GHz • 2.040GHz Time (sec)

  24. Phase rms and jitter • Linear fitting • Φrms=2πｆδT+σ • JitterδT • 0.17psec

  25. Allan standard deviation VSOP- 2 SPEC. ASD 9E-13@1sec （WPM－45GHz Lc 1% ）

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