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Weak guidance modal dispersion characteristics of an optical waveguide having a core with a sinusoidally varying gear-shaped cross section

✍ Scribed by Vivek Singh; S. P. Ojha; B. Prasad

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
132 KB
Volume
22
Category
Article
ISSN
0895-2477

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✦ Synopsis

Figure 7 Plots of the transmission ratio T versus the half-branching angle A for the AGI structure with different values of refractive index n of the PFA 3 and the AGI structures are 7.8 and 9.3Њ, respectively. The improvement in the angle is thus 1.5Њ. For still lower n , 3 further improvement would be possible.

PROPOSED FABRICATION PROCEDURE

Making a portion of the waveguide GRIN is simple with polymers. A vertically step-index film is first deposited by spin coating. Photolithography followed by reactive ion etching Ž . RIE is employed to induce a lateral step-index profile throughout the length of the Y-junction. Photobleaching by ultraviolet or visible light finally yields the required GI profile over a specified lengthᎏthe profile being fixed by the transverse intensity distribution of the focused light spot. For constructing an AGI structure, laser writing would be more w x suitable 10 .

CONCLUSION

We have proposed a new design of a polymer Y-junction using GRIN profiles that offer a branch separation at the output which is wider than that for all-step profiles. The simplicity of achieving controllable GRIN profiles in polymers makes this design commercially attractive. Its potential use therefore includes high-speed modulators, thermo-optic Ž . or electro-optic switches, adders in neural networks , etc. Work is in progress on its use in digital optical switches Ž . DOSs using asymmetric junctions.

📜 SIMILAR VOLUMES

Weak guidance modal dispersion curves of
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✍ V. N. Mishra; V. Singh; B. Prasad; S. P. Ojha 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 108 KB 👁 2 views

Using Goell's point-matching method under the weak guidance approximation, we obtain and interpret the modal dispersion cur¨es for some low-order modes sustained by an optical wa¨eguide whose guiding region has a double-con¨ex-lens-like cross section. It is found that the dispersion cur¨es are of th

Modal behavior, cutoff condition, and di
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✍ Vivek Singh; S. P. Ojha; L. K. Singh 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 107 KB 👁 2 views

MoM solutions. In Section II, a few results at a moderately high frequency were presented, which showed excellent agreement between the standard MoM code and the hybrid method. These hybrid results, while interesting, are not new given the wide use and maturity of this technique. It was necessary, h

Correction to “Modal behavior, cutoff co
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✍ Vivek Singh; B. Prasad; S. P. Ojha 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 93 KB 👁 2 views

Figure 3 Measured fundamental power and third-order IM power Ž . Ž . for P in s y20 dBm a before and b after employing the technique simulation shows that the third-order IM level at the output of a nonlinear amplifier can be reduced by the injection of a difference frequency in the amplifier togeth