A BPM-12 has been tested with a MITEL 12 way VCSEL array. The optical output was monitored on the 'scope using a Textronix optical probe.
The scope pictures of the waveforms for different drive currents are available (sending "0" data, i.e  BPM data is a 20 MHz clock)
  8 mA
10 mA
12 mA
14 mA

Sending "1" data, i.e  BPM data is a 40 MHz clock
 14mA

The rise and fall times were measured as a function of the VCSEL drive currents. The results showed rise and fall times around 1ns for drive currents above ~ 8 mA. See the summary plot here.
 

New version of BPM-12

The performance of the first chip to be measured with electrical output are given in the following plots:

• Ampltidue of current pulse versus Bias voltage  pdf file
• Rise and fall time versus bias voltage   pdf file.
• Fine delay  pdf file.
• Mark:space ratio scan for 20 MHz signal  pdf file.
• Mark:space ratio scan for 40 MHz signal  pdf file.

Optical output with the BPM-12 driving a  12 way Taiwan VCSEL array

Rise and fall time at a bias current of 12 mA

VCSEL channel number	Rise time (20%-80%)	Fall time (20%-80%)
3	0.67	0.80
4	0.72	0.76
9	0.59	1.0
10	0.67	0.75

 Scope pictures with an optical probe looking at the output of different channels of the VCSEL array being driven by BPM-12 whilst sending data "0"s (i.e. 20 MHz clock) or "1"s (i.e. 40 MHz clock).

• channel 3
• channel 4
• channel 9
• channel 10

Scope pictures showing the optical output of one channel of the VCSEL array whilst BPM-12 was sending a burst of 8 "1"s:

• 1st half of burst
• 2nd half of burst

BER tests with BPM-12 and the Taiwan VCSEL array connected to PIN/DORIC4 showed an error rate << 10^-9.
 

BPM-12 Test Plan

The production wafers of BPM-12 and DRX-12 have been produced. The wafers will be diced and the BPM-12s packaged in 100 pin QFPs and tested, The test plan for the BPM-12 is available here .

BPM-12 Production Wafer Tests

The first wafer of BPM-12 and DRX-12s has been packaged. The first BPM-12 has been tested and it works. See the 'scope photo