COMPACT-SAME-SIZE 52-MB S AND 156-MB/S SDH OPTICAL TRANSCEIVER MODULES/

Four types of compact SDH optical transceiver modules for intra- and i nteroffice transmission systems operating at 51.84- and 155.52-Mb / s have been incorporated with two types of packages which are the same s ize for both bit rates. These modules contain both a transmitter and a receiver with a clock recovery function integrated in a single packag e. They were realized in the same size of L:50 mm X W:25 mm X H:8 mm ( volume:10 cm(3)) and L:81 mm X W:31 mm X H:8 mm (volume:20-cm(3)) for intra- and interoffice system applications, respectively. The followin g technologies were used in their development: 1) three kinds of custo m IC's were implemented using a 2-mu m Si bipolar process, 2) surface- mounted SAW filters with the same size for both bit rates, and 3) high -density packaging technology to minimize receiver sensitivity degrada tion due to crosstalk noises. As a result, high receiver sensitivity o f -43.2 and -42.7 dBm was achieved for 51.84-/s and 155.52-Mb/s intero ffice transceiver modules with a wide dynamic range of over 30 dB. Als o, in transceiver modules for intraoffice system applications, a recei ver sensitivity of -37.7 and -31.7 dBm were obtained for both bit rate s.