An evolutionary configuration for an optical coherent multichannel network

We present an optical frontend for a polarization diversity receiver comprising an all-fiber hybrid and monolithic pin-photodiode pairs. The coupler hybrid consists of fused biconic TE/TM-splitters and a power splitter. Its excess loss is as low as 0.2 dB, and the polarization extinction is better than -17 dB in a 20 nm wavelength window. The photodiode pairs are grown on a semi-insulating substrate. The fiber-photodiode interfacing technique is based on self-aligned fiber positioning in grooved silicon chips. By simple adjustment the excess noise rejection of -46 dB up to 1 GHz is achieved.

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“…7). Up to 900 MHz which is the upper IF passband frequency of the envisaged DPSK system [9], the response is flat within +1 dB.…”

Section: Characterisationmentioning

confidence: 96%

All-Fiber Optical Frontend for a Balanced Polarization Diversity Receiver with 0.2 dB Excess Loss and High Noise Rejection

Deufel¹,

Eisenmann²,

Gottsmann³

et al. 1993

Journal of Optical Communications

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“…Error-correcting codes are then used to decrease the BER to a value less than iO'. UCOL block diagram (adapted from ref 15). …”

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confidence: 99%

<title>Multigigabit optical networking</title>

1992

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What is multigigabit optical networking? This is a term we are using loosely to refer to the networks with multiple gigabit data channels in order to distinguish them from networks whose aggregate bit rate is on the order of 1 Gbit/s. Current computer networks, such as Ethernet, FDDI and DQDB, suffer from lack of concurrency: at a given time, only a small number (typically one) of computers can transmit new information into the network. Therefore, each computer has to operate at the network aggregate speed, although effectively it has access only to a fraction of that bandwidth. To achieve gigabits/sec throughput, the next generation of computer networks will have to provide multiple high-speed concurrent channels to the nodes. One way to achieve concurrency is to use electronic switching, thereby placing the burden on the switch rather than each computer. Another direction is to place the burden on the optical hardware. Optical transport facilities have been recognized as an excellent choice for gigabits/sec networks due to the high bandwidths and long distances that can be reached. Moreover, WDM optical techniques allow multiple concurrent channels to be created in the same fiber, and with tunable transceivers one can potentially create networks whose topology changes dynamically in response to changing traffic patterns. In this paper, we will review a few current implementations of very high-speed networks as a background context , and then describe several prototype optical networks.

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STARNET: a multi-gigabit-per-second optical LAN utilizing a passive WDM star

Kazovsky¹,

Poggiolini²

1993

J. Lightwave Technol.

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We propose a new broad-band local area network, STARNET, based on a physical passive star topology. Over a single physical network, STARNET offers all users both a moderate-speed packet network and a high-speed WDM circuit interconnect. Based on these two data transport facilities, several topological and protocol solutions are available to the users. As a result, STARNET supports traffic of widely different speed and continuity characteristics. Each node of the network requires bromana O P~~C I I '°C'~'rC'nCtYork .video conferenc~ng . "laeo teiepnony remote l i~r a r y w v~c e Ipaoers, DDOk5.lmqe5) only two lasers and its structure facilitates the achievement of frequency stabilization for the whole network. An effort toward waeo racsimile i m a~ WWSDWWS imovles, ana c i a s~ magazines ) HIGH SPEED an experimental demonstration of a 3 Gb/s per node, FDDIcompatible (at the packet network level) STARNET is currently in progress at the Optical Communication Research Laboratory of Stanford University.Fig. 1. Some of today's and tomorrow's network services.

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An evolutionary configuration for an optical coherent multichannel network

Cited by 4 publications

References 3 publications

All-Fiber Optical Frontend for a Balanced Polarization Diversity Receiver with 0.2 dB Excess Loss and High Noise Rejection

All-Fiber Optical Frontend for a Balanced Polarization Diversity Receiver with 0.2 dB Excess Loss and High Noise Rejection

<title>Multigigabit optical networking</title>

STARNET: a multi-gigabit-per-second optical LAN utilizing a passive WDM star

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