200-Mb/s/ch 100-m optical subsystem interconnections using 8-channel 1.3-μm laser diode arrays and single-mode fiber arrays

Abstract

Synchronous parallel optical-fiber transmission is an attractive method for providing increased interconnection throughput and higher density in advanced information systems. Skew suppression (reducing transmission delay time variation), error-free fully DC-coupled data transmission capability, compactness, and low power consumption of modules are important requirements. In order to meet these requirements, we developed optical subsystem interconnections using long-wavelength laser diode arrays and single-mode fiber arrays. The major design criteria are discussed, especially as they are related to skew due to laser diode turn-on delay and receiver input optical power variation. The use of low-threshold-current laser diode arrays is an important design requirement. Based on the design criteria discussed in this work, we demonstrated 8-channel 200-Mb/s/ch 100-m transmission using compact (0.18 cc/ch/module), low power (total 280 mW/ch), fully integrated transmitter and receiver modules with an ECL (emitter coupled logic) interface. These modules include our new laser diode arrays with low threshold current of 3.2 mA. Performance results showed that these modules are very effective as interconnections between synchronously operating subsystems.

Optical subcarrier multiplexing transmission for base station with adaptive array antenna

“…In order to estimate the effect of the additive noise and the required , these phase noise of the reference component and the VCOs are assumed to ideally be time-invariant. According to [15], the variance of the phase of the LO signal due to additive noise can be written as (11) where is the spectral density of the additive noise, which is defined by the ratio between noise power per hertz and clock reference power as . The integral of the square of the transfer function defines the noise bandwidth of the loop and commonly is given the symbol .…”

“…Therefore, it is difficult for CSs and BSs to be constructed at low cost. Moreover, in OFP transmission, the skew of plural optical fibers becomes variable [11] and causes different arrival times of transmitted optical signals since equivalent optical-fiber lengths fluctuate corresponding to ambient temperature. This is a serious obstacle to the operation of spatial filtering on adaptive array antennas with remote weight-control/modification via optical fibers.…”

A spanning multichannel linked hypercube: a gradually scalable optical interconnection network for massively parallel computing

“…Delays for commercially available optical fixed transmitters and receivers are in the range of 1 ns and 1.8 ns, respectively [49], [50], while those of tunable transmitters, are 50 ns [51]. In SMLH, the optical star couplers and the grating demultiplexers are all passive components and, therefore, their time delays are very small and can be ignored in this estimation.…”

Polarization-independent bidirectional 4×4 optical switch in free space

“…The use of optical interconnection techniques can increase the information quantity and achieve data transmission at a highspeed and high-integration density. To realize an optical interconnection, various methods using holograms, optical fiber arrays and laser arrays have been proposed [1][2][3][4][5][6].…”