Abstract: An improved edge protector and packaging system comprises a generally right angle member having a plurality of right angle bands joined by a plurality of intermediate arms. The edge protector and packaging system allow for the protection of corners typically exposed to damages during transportation and storage. The edge protector and packaging system may be of different sizes to accommodate for a wide variety of shapes and structures having angles exposed to damages that require some kind of protection.

Abstract: Quasi-phase matched (QPM) second-harmonic (SH) generation in the reflection geometry is described. The SH intensity can be strongly enhanced by spatially modulating the optical properties of the nonlinear medium. This type of quasi-phase matching is demonstrated using an Al.sub.0.8 Ga.sub.0.2 As/GaAs heterostructure designed for .lambda.=1.06 .mu.m incident light. The SH light intensity generated in reflection from the heterostructure is enhanced 70 times relative to the SH response of a homogeneous GaAs wafer. A Fabry-Perot resonant cavity design employs this structure to make thin films with extremely high SH generation efficiencies. This is of particular interest used in vertical cavity surface emitting lasers (VCSELs).

Abstract: A plurality of signals are mixed in a non-linear waveguide for generating a near field sum frequency output pattern. The near field output pattern is monitored for changes which correspond to changes in the phase relationship between the plurality of signals. A grating provides a mask through which the near field pattern may propagate. Detectors positioned above the grating at predetermined locations measure the intensity of the near field pattern and a change in the phase relationship between the input signals is determined from a change in the intensity of the near field output pattern.

Abstract: By using a non-linear guided wave optical time domain reflectometry (OTDR) technique, specific features of an optoelectronic integrated device may be probed by detecting the reflections and back-scattering of a short light pulse along a waveguide interconnect. An integrated optical correlator in the form of a second harmonic generation (SHG) waveguide and a photodetector array detects and measures ultra-short pulses for optical ranging. Used with a standard CCD camera, the direct images of the autocorrelation of compressed Nd-Yag pulses (FWHM of 5 ps) have been monitored at video rates. Used with a cooled CCD camera for OTDR, reflections from samples have been observed with an interfeature resolution of about 0.15 mm in GaAs, limited by the FWHM of the laser pulses. Appropriate signal processing can increase the positioning resolution to better than 50 .mu.m. Additional applications are demonstrated, including the monitoring of fiber lengths (to within 30 .mu.m in real time) and temperature sensing.

Abstract: An active surface-emitting harmonic generator based on a multilayer Al.sub.x Ga.sub.1-x As non linear waveguide integrated monlithically with a tunable InGaAs single quantum well laser is provided. Controlling the difference in frequency between a signal provided by the tunable laser and another input optical signal allows an output signal to be directed to any of a plurality of directions in space. Positioning detectors near the monolithic device allows spatial addressing. The controllable monolithic device may also be used to scan and thus to read data stored on holographic media.