tailieunhanh - Advances in optical and photonic devices Part 13

Tham khảo tài liệu 'advances in optical and photonic devices part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chip-Scale Programmable Photonic Filters 229 function only one of several surface plots is shown . This stability criterion fixes the poles of a filter response and provides a filter whose magnitude response is shown in the first Bode plot in Fig. 5. The second Bode plot in Fig 5 is the result optimized by then moving the zeros of the transfer function. The very sharp resonance is therefore determined in a manner that is inherently stable since the zeros of the transfer function do not affect stability. Fig. 5. Predicted bandpass behavior from a tunable two-dimensional active lattice filter. Stability is first set by the roots of the denominator then the response is optimized by adjusting the remaining degrees of freedom in the denominator. The result is a very sharp filter resonance under fully stable operating conditions. 5. Conclusion The photonics industry today is at a technically exciting and economically important juncture The transition from discrete components to early modest levels of integration. There are early indications of commercial promise for integrated photonics including dedicated start-ups such as Infinera and Luxtera and active development groups at large companies such as Intel. The current literature and prevailing views accept most of the basic lessons gleaned from the history of the electronic integrated circuit the need for an integrated manufacturing platform the value of chip real estate and overall yield. The role of gain is also well appreciated especially in driving towards a scalable architecture. But gain also enables programmability and therefore unlocks huge economic advantages of scale and scope. For example the power to program microprocessors DSPs and FPGAs allows the development and manufacturing costs of these devices to be amortized over a large number of niche applications with medium or small market sizes. The profitable market of one is achieved routinely by programmed microprocessors digital signal processors DSPs and .