DTS FO Hardware Design Bryan Anderson Jodrell Bank Observatory
Post on 07-Feb-2016
22 Views
Preview:
DESCRIPTION
Transcript
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
AtacamaAtacama
LargeLarge
MillimeterMillimeter
ArrayArray
DTS FO Hardware DTS FO Hardware DesignDesignBryan AndersonBryan AndersonJodrell Bank Jodrell Bank Observatory Observatory
Co-authors: D.C. Brown, M. Bentley & R. McCool
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
2
ALMA Project
Contents of Talk
• Fibre Interconnects (everywhere)• Optical Receiver (correlator, AOS or OSF)• Optical Transmitter (antenna)• Optical Multiplexer-Monitor Module (antenna)• Optical-Fibre Amplifier Module (AOS)• Optical Demultiplexer-Switch Module (AOS/OSF)• Monitor, Control and Safety
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
3
ALMA Project
OLA
OLA
Patch
Panel
8 fibres
250wide
8 fibres
64wide
Fibre
Manage
64 fibres
OtherServices
64 wide
1:12demuxswitch
1:12demuxswitch
64:1switch OSA
3 wide 192 wide
To
correlator
quadrants
7 wide
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
4
ALMA Project
switching
regulator
regulator
regulator
switching
linear
48 V
+3.3 V
-2.0 V
+8 V
+12 V
MTRX192L
one of three
PIC
16F877
compensation
ADC12-bit
DAC12-bit
powermonitor
keep-alive
M&C bus
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
5
ALMA Project
Optical Receiver
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
6
ALMA Project PIC
16F877
switching
regulator
regulator
regulator
switching
switching
48 V
+5.0 V
+5.0 V
-5.2 V
TECTH
mod
driver
EAM
MD
LD
current
temp
current
power
Agere E2580
switching
TECdriver
LDdriver
duty cycle
drive
offset
temp
power
TECs
LDs
driversEAM
10 Gbps
light
12-bitADC
12-bitDAC
12-bitDAC
12-bitDAC
12-bitDAC
12-bitDAC
keep-alive
M&C bus
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
7
ALMA Project
optical
mux
12:1
wide12
overpower
detector
alives
keep
-20 dB
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
8
ALMA Project
Optical-Fibre Amplifier Module
• Uses an oem EDFA module– 20 dB gain, +17 dBm output power– Size: 100 x 100 x 15 mm– Interface: RS232, 25-pin connector, +5V @ 6 -
8W off 48V bus
• Plug-in with PIC controller, 8 per crate, 64 OFAM in 2 racks
• Keep-alive feedback from 4 sets of receivers
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
9
ALMA Project
Optical Demux-Switch Module
WDM
demux
optical
4 x 4
switch
optical
4 x 4
switch
optical
4 x 4
switch
quadrants
correlator
To
ganged control
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
10
ALMA Project
Optical Demux-Switch Module
• Integrate demux-switch functions: hide 12 interconnects
• Make as plug-ins with PIC controller and power supply off 48V bus
• 4 ODSMs per crate • 4 - 6 crates per rack• Requires total of 3 - 4 racks
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
11
ALMA Project
Monitor and Control
• Slaves: answer only• Report the truth• Remember calibrations and exceptions• Parameters in non-volatile memory• Monitor and control everything: no
potentiometers• Set/trip out philosophy for safety
DTS FO Hardware Design04/22/23
Back End Preliminary Design Review, 2002 April 24-25, Granada, Spain
12
ALMA Project
Safety
• By design– Physical access restricted– Switch on under software control– Switch off via hardware or software
• Soft switching for transmitters?– Hardware keep-alives:
• OMMM to transmitters• Receivers to optical amplifiers (256 twisted
pairs!)
top related