Updated from July 28JDS Uniphase ( JDSU) shares jumped 12% Thursday after the optical networking company posted a fourth-quarter loss. For its quarter ended June 30, the San Jose, Calif., maker of optical networking components posted a loss of $24.3 million, or 2 cents a share. That's narrower than the year-ago $61.6 million, or 4 cents a share. Revenue rose to $174 million from $161 million a year earlier. Excluding one-time items, the company lost $14.5 million, or a penny a share. Analysts expected a penny-a-share loss on sales of $167 million for the fourth quarter. Looking ahead to the fiscal first quarter ending in September, the telecom parts maker expects its pro forma loss to widen a penny to 2 cents a share. But JDS also called for a sequential increase in sales of somewhere between 8% and 13%. Analysts polled by Thomson Analytics expected break-even results on sequential top-line growth of slightly more than 2%. JDS rose 35 cents to $3.35.