---------- Forwarded message ----------
From: Csaba Soos <Csaba.Soos@cern.ch>
Date: Mon, Aug 18, 2014 at 10:21 AM
Subject: RE: VTTx, VTRx decoupling capacitors
To: Tullio Grassi-ext <tullio.grassi@gmail.com>
Cc: Jan Troska <Jan.K.Troska@cern.ch>


Hi,

 

ah ok, they are both AC coupled.

 

Cheers, Csaba

 

From: Tullio Grassi [mailto:tullio.grassi@gmail.com]
Sent: 18 August 2014 10:19
To: Csaba Soos
Cc: Jan Troska
Subject: Re: VTTx, VTRx decoupling capacitors

 

hi Csaba,

 i was not clear, i am asking about capacitors on the data lines (TD, RD +/-)

 Tullio

 

On Mon, Aug 18, 2014 at 10:14 AM, Csaba Soos <Csaba.Soos@cern.ch> wrote:

Hi Tullio,

 

the laser driver in the transmitter, as well as the ROSA in the receiver path are properly decoupled on the VTRx. However, we recommend that the power

supply is properly decoupled on the host board as well. Please note that due to physical constraints on the board, we cannot install bulk capacitors so they

need to be present on the host board.

 

Cheers, Csaba

 

From: Tullio Grassi [mailto:tullio.grassi@gmail.com]
Sent: 18 August 2014 09:55
To: Jan Troska; Csaba Soos
Subject: VTTx, VTRx decoupling capacitors

 

hi,

 i cannot find in the specs or in the App Note if the TOSA or ROSA have embedded decoupling capacitors, or if i need to put them on the host board

 Tullio