Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broadband optical isolator in fibre optics   We propose a broadband optical diode, which is composed of one achromatic
reciprocal quarter-wave plate and one non-reciprocal quarter-wave plate, both
placed between two crossed polarizers. The presented design of achromatic wave
plates relies on an adiabatic evolution of the Stokes vector, thus, the scheme
is robust and efficient. The possible simple implementation using fiber optics
is suggested.

37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn