APD Receiver
AssemblyThe detection chain: an avalanche photodiode with a regulated high-voltage bias multiplies the picowatt backscatter signal, followed by a transimpedance amplifier, variable-gain stage, and sampling ADC. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.
Bill of materials for APD Receiver
6 top-level lines as of r118239| # | Item / sub-assembly | Part no. | Qty/assy | Ext. qty | Parts | Type |
|---|---|---|---|---|---|---|
| 1 | Avalanche Photodiode | otdr-tester-apd | 1× | 1 | · | part |
| 2 | APD Bias Supply | otdr-tester-apd-bias | 1× | 1 | · | part |
| 3 | Receiver TIA | otdr-tester-rx-tia | 1× | 1 | · | part |
| 4 | Variable-Gain Amplifier | otdr-tester-vga | 1× | 1 | · | part |
| 5 | Sampling ADC | otdr-tester-adc | 1× | 1 | · | part |
| 6 | SMD Passive (R/C/L) | smd-passives | 60× | 60 | · | part |