A balance-unbalance conversion element that easily adjusts the phase balance between two balance signals. The invention also refers to new intermediates which are useful to carry out the process of the invention. The transfer andor the display is performed automatically. Also, a port card, comprising a plurality of optical transmitter elements operative to produce respective optical beams from the input optical signals; and an array of beam steering elements operative to controllably orient the optical beams into respective transmit directions.